Mark M. answered • 04/19/20
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sin 4x cos 9x - cos 4x sin 9x = -0,8
sin (4x - 9x) = -0.8
sin -5x = -0.8
-5x ≈ -0.92729
x ≈ 0.185 radians
China B.
asked • 04/19/20Solve sin ( 4 x ) cos ( 9 x ) − cos ( 4 x ) sin ( 9 x ) = − 0.8 for the smallest positive solution
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