Senx=3cosx

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Solution for Senx=3cosx equation: 


Simplifying
Senx = 3cosx

Solving
enxS = 3cosx

Solving for variable 'e'.

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

Divide each side by 'nxS'.
e = 3cn-1osS-1

Simplifying
e = 3cn-1osS-1

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