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# Pythagorean Identity Involving $\sin(\theta)$

TRIG-7LREKH

Which of the following is a Pythagorean Idenitty involving the $\sin(\theta)$

A

$\sin^{2}(\theta) - \cos^{2}(\theta) = 1$

B

$\sin(\theta) + \cos(\theta) = 1$

C

$\sin^{2}(\theta) + \cos^{2}(\theta) = -1$

D

$\sin^{2}(\theta) + \cos^{2}(\theta) = 1$