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prove that[tex]sin 5x+sin3x/cos5x+cos3x=tan4x[/tex]

Sagot :

Pepe11idn
sin5x + sin3x = 2sin4x.cosx
cos5x + cos3x = 2cos4x.cosx
so [tex] \frac{2sin4x.cosx}{2cos4x.cosx} [/tex] = [tex] \frac{sin4x}{cos4x} [/tex]
= tan4x

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