Angle A is the complement of angle B.
Which equation about the two angles must be true?

A) cos B = sin B
B) sin A = sin B
C) cos A = sin B
D) sin A = cos A

C) cos A=sin B

Step-by-step explanation:

A is complement of B: A+B=90⁰

Sin(A)=sin(90-B)=cos(B)

Cos(A)=cos(90-B)=sin(B)

So c)

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.

step-by-step explanation:

where is the questions