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4 years ago

12

Prove that

+cos3x=tan4x" alt="sin 5x+sin3x/cos5x+cos3x=tan4x" align="absmiddle" class="latex-formula">

1 answer:

liraira [26]4 years ago

6 0

Sin5x + sin3x = 2sin4x.cosx
cos5x + cos3x = 2cos4x.cosx
so $\frac{2sin4x.cosx}{2cos4x.cosx}$ = $\frac{sin4x}{cos4x}$
= tan4x

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