MCQ
$\frac{\sin 5x+\sin 3x}{\cos 5x+\cos 3x}=..............$
- ✓$\tan 4x$
- B$\cos 4x$
- C$cosec 4x$
- D$\sin 4x$
$\frac{\sin 5x+\sin 3x}{\cos 5x+\cos 3x}$
$=\frac{2\sin\frac{5x+3x}{2}\cos\frac{5x-3x}{2}}{2\cos\frac{5x+3x}{2}\cos\frac{5x-3x}{2}}$
$=\frac{\sin 4x\cos x}{\cos 4x\cos x}=\tan 4x$
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