Question

Which letter could represent sin -135°?
A. a
B. b
C. c
D. d

Answer 1

Option D.

Explanation:

we know that

Angle -135° is equal to

360°-135°=225°

The angle belong to the III quadrant

225°-180°=45°

sin(45°)=d/1=d

therefore

sin(-135°)=-sin(45°)=d ---> the value is negative