Which of the statements below provides evidence that sine and cosine are cofunctions? sin(30°)=cos(30°) sin(60°)=-cos(60°) sin(30°)=cos(-30°) sin(30°)=cos(60°)

The sine of an angle equals the cosine of its complement.

D. sin(30°) = cos(60°)

Option D. is the answer.

Step-by-step explanation:

In this question we have to find the statement that provides incidence that sine and cosine are co-functions.

As we know co function identities clearly say

(

A. For x = 30° or

Or

B. For x = 60°

sin(90-60) = cos(60)

sin(30) = cos(60)

Which is similar to option D.

Therefore, Option D. is the the correct answer.

a complex number is a number that can be expressed in the form a + bi, where a and b are real numbers, and i is a solution of the equation x2 = −1. because no real number satisfies this equation, i is called an imaginary number. has no real solution, since the square of a real number cannot be negative.

answer

a,b, and d

explanation

a reflection angle is more than

but less than;

an angle that measures

is a reflex angle.(true)

an angle that measures less than

is acute.(true)

provided we are considering angles greater or equal to zero.

an acute angle lies in the range.

an obtuse angle is less than 180° but more than 90°

an angle that measures 300° is obtuse (false)

an angle that measures 65° is an acute angle.(true)