another trig equation

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February 11th 2011, 06:27 AM
kassums17

another trig equation

2sin squared thaata + 3cos thaata - 3 = 0

solve the equation please!
February 11th 2011, 06:45 AM
Ackbeet

Assuming you mean

$2\sin^{2}(\theta)+3\cos(\theta)-3=0,$

I would use $\sin^{2}(\theta)+\cos^{2}(\theta)=1$ to change the first term into cosines, and then use the quadratic formula. What does that give you?

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