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26 March, 08:41

Solve for first two positive solutions sin (3x) cos (4x) + cos (3x) sin (4x) = - 0.9

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  1. 26 March, 09:32
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    sin (3x) cos (4x) + cos (3x) sin (4x) = - 0.9

    Then sin (3x+4x) = 0.9

    sin (7x) = 0,9

    Arcsin (,9) = 64.158 degrees or 115.842

    x = 9.165 and 16.549
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