Use a calculator to find the function value. Give your answer rounded to seven decimal places, if necessary.
-$$\sin ^ { 2 } 57 ^ { \circ } + \cos ^ { 2 } 57 ^ { \circ }$$
A) 1
B) -1
C) 0
D) 2

Question

Quizplus · Accepted Answer

This is an application of the Pythagorean identity in trigonometry, which states that $\sin^2 \theta + \cos^2 \theta = 1$ for any angle $\theta$. This identity holds true regardless of the angle, so the calculation is not necessary to determine the answer.

Use a Calculator to Find the Function Value sin⁡257∘+cos⁡257∘\sin ^ { 2 } 57 ^ { \circ } + \cos ^ { 2 } 57 ^ { \circ }sin257∘+cos257∘

Use a Calculator to Find the Function Value $\sin ^ { 2 } 57 ^ { \circ } + \cos ^ { 2 } 57 ^ { \circ }$