Find x of the equation sin5x+sin3x=cosx

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- Dec 23rd 2009, 11:43 PMngkh87trigonometry problem
Find x of the equation sin5x+sin3x=cosx

- Dec 24th 2009, 01:46 AMLucio Carvalhohelp for the exercise
Hello ngkh87,

Here it is my point of view about the exercise.

I hope you will understand!

Bye! - Dec 24th 2009, 06:47 AMSoroban
Hello, ngkh87!

My solution is similar to Lucio's . . .

Quote:

Solve for

. . which Lucio derived for us.

The equation becomes: .

And we have: .

Factor: .

We have two equations to solve:

. .

. .

. . Hence: .