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Sin(4x)cos(6x)-cos4(x)sin(6x)=-0.45
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Sin(4x)cos(6x)-cos4(x)sin(6x)=-0.45

User RockFrenzy
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Above uses the addition formula so LHS is equal to sin(4x-6x) => sin(-2x) => -sin(2x). Since you didn’t give the range I’ll assume you can do the later part on your own but x = [arcsin(0.45)]/2. For pi/2 < x < 0
User Jirka Hanika
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