# Math Help - Solving trigonmetric equations

1. ## Solving trigonmetric equations

For $\frac{\pi}{2} with $\cos x = -\sin \frac{\pi}{6}$, find the value of x.

The question also states to not evualate the value of $\sin \frac{\pi}{6}$

How do I do this question?

2. Originally Posted by user_5
For $\frac{\pi}{2} with $\cos x = -\sin \frac{\pi}{6}$, find the value of x.

The question also states to not evualate the value of $\sin \frac{\pi}{6}$

How do I do this question?
Dear user_5,

Use the trignometric identity, $cos\left(\frac{\pi}{2}+A\right)=-sinA$

Hope this will help you.