$\tan 7\frac{1}{2}^\circ =...$
$\tan 7\frac{1}{2}^\circ =...$
- A
$\sqrt 6 + \sqrt 3 + \sqrt 2 - 2$
- B
$\sqrt 6 - \sqrt 3 + \sqrt 2 - 2$
- C
$\sqrt 6 - \sqrt 3 + \sqrt 2 + 2$
- D
$\sqrt 6 - \sqrt 3 - \sqrt 2 - 2$
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- [IIT 1979]
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સાબિત કરો કે : $\sin 2 x+2 \sin 4 x+\sin 6 x=4 \cos ^{2} x \sin 4 x$
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