simple trig identities problem!
Solve the following quadratic trig equations algebraically (without graphing technology) for the domain 0o < x < 360o. Use exact solutions whenever possible.
a) 6cos^2(theta ) + cos(theta ) - 1 = 0
b) 2 - 2sin^2( theta) = cos(theta )

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put cos(theta) = x in the first equation and solve for x, and then substitute it back into cos theta

i'm sorry but i don't understand any of that...

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