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30 August, 10:48

Sin^2 (20°) + cos^2 (20°) =

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  1. 30 August, 12:19
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    Step-by-step explanation:

    There is an important trig identity which you must know: (sin x) ^2 + (cos x) ^2 = 1.

    Therefore, sin^2 (20°) + cos^2 (20°) = 1
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