Question

If the sin 90° is 1, then the cos ____ °= _____. 90° ; 1 over 2 0° ; square root 2 over 2 90° ; square root 3 over 2 0° ; 1

Answer 1

HELLO DEAR,

If We Try The First Choice, Cos (90) Is equal to 1 and not 1/2. First choice is Not Possible.

Cos(0) Is Not Square Root 2 Over 2 But Instead, 1. The Second Choice Is Also Wrong.

From the first choice

we know that cosine of 90 is 1 and not square root 3 over 2.

We have the last choice to be the answer. Indeed, cosine of zero is 1. 

HENCE the last answeer is correct

I HOPE ITS HELP YOU DEAR,
THANKS

Answer 2

1, because the angles are complementary