$\displaystyle

sin(x+50)=2cosx

$

It's weird that this question doesn't have any special angle or any sort, I don't know how to solve this question with $\displaystyle 50^\circ$ as the angle!!

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- Jan 28th 2010, 03:04 AMPunchWeird basic question
$\displaystyle

sin(x+50)=2cosx

$

It's weird that this question doesn't have any special angle or any sort, I don't know how to solve this question with $\displaystyle 50^\circ$ as the angle!! - Jan 28th 2010, 03:23 AMCaptainBlack
- Jan 28th 2010, 03:26 AMPunch
- Jan 28th 2010, 03:28 AMCaptainBlack
- Jan 28th 2010, 03:29 AMPunch
- Jan 28th 2010, 04:03 AMHallsofIvy
It is the inverse function to tangent. tan(arctan(x))= x and arctan(tan(x))= x as long as x is between $\displaystyle -pi/2$ and $\displaystyle \pi/2$. Also called $\displaystyle tan^{-1}(x)$ which must not be confused with $\displaystyle \frac{1}{tan(x)}= cot(x)$.