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7 March, 16:18

Enter the expression 2cos2 (θ) - 1, where θ is the lowercase Greek letter theta.

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  1. 7 March, 18:51
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    2 cos2 (θ) - 1 = 0

    2cos2 (θ) = 1

    cos2 (θ) = 1/2

    2θ=arc cos1/2

    2θ=60 degrees

    θ=30 degrees
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