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28 April, 14:14

Sin78 * cos42+cos78*sin42 evaluate without the use of a calculator

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  1. 28 April, 16:48
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    Sin a * cos b + cos a * sin b=sin (a+b)

    sin 78 * cos 42 + cos 78 * sin 42=sin (78+42) = sin 120=sin (180-120) =

    sin 60=√3 / 2

    Answer: sin 78 * cos 42 + cos 78 * sin 42 = √3 / 2
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