Use the properties of the trigonometric functions to find the exact value of the expression. Do not use a calculator.
-$\sin ^ { 2 } 80 ^ { \circ } + \cos ^ { 2 } 80 ^ { \circ }$
A) 2
B) 0
C) 1
D) -1

Question

Quizplus · Accepted Answer

This expression is an example of the Pythagorean identity in trigonometry, which states that $\sin^2\theta + \cos^2\theta = 1$ for any angle $\theta$.

Use the Properties of the Trigonometric Functions to Find the Exact