Verify the identity pre calculus

The verification is in the explanation.

Step-by-step explanation:

I'm going to start with the left and play with it til I get the right.

First step: Expand the binomial square using .

Second step: Realize and are reciprocal functions. Their product will be 1.

[Side note: .]

Third step: Recall the Pythagorean Identities and :

a. 74 degrees

step-by-step explanation:

because the lines through the side and the box in the corners shows that these are congruent triangles and since they are mirrored the 37 degrees is also mirrored so the answer is 37 * 2 which is 74.

$4

step-by-step explanation:

$30×5=$150

$150 minus $130=$20

$20÷5=$4.

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