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6 September, 20:22

What is cos (x°) = cos (57°) cos (94°) - sin (57°) sin (94°)

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  1. 6 September, 20:46
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    Note that the given cos (57°) cos (94°) - sin (57°) sin (94°) resembles the formula

    cos a cos b - sin a sin b, which is cos (a+b).

    Therefore, cos (57°) cos (94°) - sin (57°) sin (94° = cos (57+94) = cos 151.
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