Prove the following- sin x-sin 3x-cos x-cos 3x - tan 2x

LHS= sin x+sin3x / cos x+cos 3x = 2sin( x+3x 2 #160;) #160;cos( x 3x 2 #160;) #160; #160;/2 cos( x+3x 2 #160;) #160;cos( x ...

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L'Hospital Rule to Remove Indeterminate Form

Prove the fol...

Question

Prove the following:
$\frac{s i n x + s i n 3 x}{c o s x + c o s 3 x} = t a n 2 x$

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Solution

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