Question

Which equation shows that the Pythagorean identity is true for ø = 270º?

Answer 1

Answer: (a)

Step-by-step explanation:

Given

angle is $270^{\circ}$

Sine and cosine at this angle is

$\Rightarrow \sin 270^{\circ}=-1\\\Rightarrow \cos 270^{\circ}=0$

Put the values in the identity $\sin ^2\phi +\cos^2 \phi=1$

$\Rightarrow (-1)^2+(0)^2=1$

The same thing is depicted by option (a)