# Trigonometric Proof

by likearollings
Tags: proof, trigonometric
 P: 27 I am not quite sure how to prove this, I can see it involves using a double angle formula (see http://mathworld.wolfram.com/Double-AngleFormulas.html). I have tried working backwards but to no avail. Any ideas? Uploaded with ImageShack.us
 Engineering Sci Advisor Thanks P: 6,041 Use $$\sin a \cos b = (\sin (a+b) + \sin(a-b))/2[/itex]  P: 27 Thanks! I will give that a go P: 27 ## Trigonometric Proof  Quote by AlephZero Use [tex]\sin a \cos b = (\sin (a+b) + \sin(a-b))/2[/itex] Thanks, I managed to do it using [tex] \cos a \sin b = (\sin (a+b) - \sin(a-b))/2$$

PROBLEM SOLVED!

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