sin(x)*sin(3x)+cos(4x)=0

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Solution for sin(x)*sin(3x)+cos(4x)=0 equation: 


Simplifying
sin(x) * sin(3x) + cos(4x) = 0

Remove parenthesis around (3x)
ins * x * ins * 3x + cos(4x) = 0

Reorder the terms for easier multiplication:
3ins * x * ins * x + cos(4x) = 0

Multiply ins * x
3insx * ins * x + cos(4x) = 0

Multiply insx * ins
3i2n2s2x * x + cos(4x) = 0

Multiply i2n2s2x * x
3i2n2s2x2 + cos(4x) = 0

Remove parenthesis around (4x)
3i2n2s2x2 + cos * 4x = 0

Reorder the terms for easier multiplication:
3i2n2s2x2 + 4cos * x = 0

Multiply cos * x
3i2n2s2x2 + 4cosx = 0

Reorder the terms:
4cosx + 3i2n2s2x2 = 0

Solving
4cosx + 3i2n2s2x2 = 0

Solving for variable 'c'.

Move all terms containing c to the left, all other terms to the right.

Add '-3i2n2s2x2' to each side of the equation.
4cosx + 3i2n2s2x2 + -3i2n2s2x2 = 0 + -3i2n2s2x2

Combine like terms: 3i2n2s2x2 + -3i2n2s2x2 = 0
4cosx + 0 = 0 + -3i2n2s2x2
4cosx = 0 + -3i2n2s2x2
Remove the zero:
4cosx = -3i2n2s2x2

Divide each side by '4osx'.
c = -0.75i2n2o-1sx

Simplifying
c = -0.75i2n2o-1sx

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