# solving a trig equation

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• Feb 16th 2011, 01:20 PM
kassums17
solving a trig equation
cos squared theta + sin theta + 1 = 0

should I just use the quadratic formula first and go from there?
• Feb 16th 2011, 01:29 PM
e^(i*pi)
No, the quadratic formula is second.

First change your $\cos^2 \theta$ to $\sin^2 \theta$ using the identity $\sin^2 \theta + \cos^2 \theta = 1$