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Question

Determine, for what value of θ(0oθ90o),2cos2θ3cosθ+1=0

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Solution

By quadratic formula, cosθ=3+94(2)4=3+14=44 or 24
=1 or 12
cosθ=1 or cosθ=12
θ=0o or θ=60o.

1214433_1395979_ans_a90220240a8f4ffdbb835aaa91b19cb2.jpg

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