(cos x - siny)/ (cosy - sinx) = (cosy + sinx)/(cosx+siny) - Thanks for the help
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Write sines in terms of cosines, meaning if you have sin x write cos(pi/2 - x). Then use the sine and cosine sum/difference formulas.
Originally Posted by ThePerfectHacker Write sines in terms of cosines, meaning if you have sin x write cos(pi/2 - x). Then use the sine and cosine sum/difference formulas. this might be a stupid question, but if you use the sum/difference formula on cos (2/pi-x) wont you just be back at sin x?
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