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anonymous
 5 years ago
trig identity help!!!
Solve the following quadratic trig equations algebraically (without graphing technology) for the domain 0º < x < 360º. Use exact solutions whenever possible.
a) 6cos2( theta) + cos(theta )  1 = 0
b) 2  2sin2(theta ) = cos( theta)
anonymous
 5 years ago
trig identity help!!! Solve the following quadratic trig equations algebraically (without graphing technology) for the domain 0º < x < 360º. Use exact solutions whenever possible. a) 6cos2( theta) + cos(theta )  1 = 0 b) 2  2sin2(theta ) = cos( theta)

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amistre64
 5 years ago
Best ResponseYou've already chosen the best response.06cos(2x) + cos(x) 1 = 0? or 6cos(x)^2 + cos(x) 1 =0? ill assume this one. (6)(1) = 6 factors of (6) that equal (+1): (3)(2) (cos(x)+(3/6)) (cos(x)(2/6)) cos(x) =(1/2) or cos(x)=(1/3) x = 120 and 240 for cos(1/2) and x= some angle in Q1 and Q2 that has a cos^1(1/3) if I did it right :)
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