1.
Equalities that involve trigonometric functions and are true for every value of the occurring variables are called...
Correct Answer
A. Trigonometric identities
Explanation
Trigonometric identities are equalities that hold true for all values of the variables involved. These identities are derived from the fundamental properties of trigonometric functions and are widely used in solving trigonometric equations and simplifying expressions. They help establish relationships between different trigonometric functions and are essential tools in various branches of mathematics and physics.
2.
Any equation that contains a trigonometric function is...
Correct Answer
B. Trigonometric equation
Explanation
A trigonometric equation is a type of equation that includes one or more trigonometric functions. It involves finding the values of the variables that satisfy the equation. In contrast, algebraic trigonometry refers to the study of algebraic relationships involving trigonometric functions. Trigonometric constants are specific values of trigonometric functions, such as the value of sine or cosine at certain angles. A constant equation is an equation where the variables are absent, and it represents a statement that is always true or always false. Therefore, the correct answer is "Trigonometric equation" because it accurately describes an equation that contains a trigonometric function.
3.
A trigonometric identity expressing the Pythagorean theorem in terms of trigonometric function is...
Correct Answer
B. Pythagorean trigonometric identity
Explanation
The Pythagorean trigonometric identity is a trigonometric identity that relates the three main trigonometric functions (sine, cosine, and tangent) in a right triangle. It states that in a right triangle, the square of the length of the hypotenuse is equal to the sum of the squares of the lengths of the other two sides. This identity is derived from the Pythagorean theorem, which states that in a right triangle, the square of the length of the hypotenuse is equal to the sum of the squares of the lengths of the other two sides.
4.
Which of these is a trigonometric function?
Correct Answer
A. Cotangent
Explanation
Cotangent is a trigonometric function that represents the ratio of the adjacent side to the opposite side in a right triangle. It is abbreviated as cot. The other options, Division, Bracket, and BODMAS, are not trigonometric functions. Division is a mathematical operation, Bracket is a punctuation mark used in mathematical expressions, and BODMAS is an acronym for the order of operations in mathematics.
5.
Identities involving certain functions of one or more angles are...
Correct Answer
C. Trigonometric identities
Explanation
Trigonometric identities are mathematical equations that relate the angles and lengths of a triangle. These identities are useful in solving trigonometric equations and simplifying expressions involving trigonometric functions. They help in proving various mathematical theorems and solving problems in fields such as physics, engineering, and geometry. Therefore, the correct answer is "Trigonometric identities."
6.
Identities involving certain functions of one or more angles are called...
Correct Answer
A. Quotient identities
Explanation
Quotient identities involve the ratios of trigonometric functions, such as sine, cosine, and tangent, and are used to express one trigonometric function in terms of another. Reciprocal identities involve the reciprocal relationships between trigonometric functions, such as sine and cosecant, cosine and secant, and tangent and cotangent. Pythagorean identities involve the relationship between the squares of the trigonometric functions, such as sine squared plus cosine squared equals one. Half-angle identities involve expressing trigonometric functions of half an angle in terms of trigonometric functions of the original angle. Since the question asks for identities involving functions of angles, the correct answer is Quotient identities.
7.
What can be used to find the missing lengths of the sides of a right triangle?
Correct Answer
A. Pythagorean theorem
Explanation
The Pythagorean theorem can be used to find the missing lengths of the sides of a right triangle. This theorem states that in a right triangle, the square of the length of the hypotenuse (the side opposite the right angle) is equal to the sum of the squares of the lengths of the other two sides. By rearranging this equation, we can solve for the missing side length when given the lengths of the other two sides. The Pythagorean theorem is a fundamental concept in geometry and is widely used to solve problems involving right triangles.
8.
Trigonometric identities showing the relationship between sine and cosine are...
Correct Answer
B. Cofunction identities
Explanation
Cofunction identities are trigonometric identities that show the relationship between sine and cosine. They state that the sine of an angle is equal to the cosine of its complement, and vice versa. These identities are useful in simplifying trigonometric expressions and solving trigonometric equations. They can also be used to find the values of trigonometric functions for angles that are not commonly known. Therefore, the correct answer is cofunction identities.
9.
An equation which is always true is referred to as...
Correct Answer
A. Identity
Explanation
An equation which is always true, regardless of the values of the variables involved, is referred to as an identity. This means that the equation holds true for all possible values of the variables. It is a fundamental concept in mathematics and is used to establish relationships between different mathematical expressions.
10.
A right triangle with some regular feature that makes calculations on the triangle easier, or for which simple formulas exist is...
Correct Answer
A. Special Right triangle
Explanation
A special right triangle is a right triangle that has specific properties or ratios that make calculations and problem-solving easier. These properties include having angles that are multiples of 30 degrees or 45 degrees, or having side lengths that form simple ratios such as 3:4:5 or 5:12:13. Special right triangles have well-known formulas and relationships that can be used to quickly find missing side lengths or angles without the need for complex calculations.