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Differentiation Using Substitution

Prove that ta...

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Prove that tan20^°+2tan50^°=tan70^°

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tan 70^{\circ} = tan 20^{\circ} + 2 tan 50^{\circ}

Prove that $t a n 70^{\circ} = t a n 20^{\circ} + 2 t a n 50^{\circ} .$
Or

Prove that $1 + c o s 2 x + c o s 4 x + c o s 6 x = 4 c o s x c o s 2 x c o s 3 x$

Q. the value of

tan 20^{\circ} + 2 tan 50^{\circ} - tan 70^{\circ}

tan 20^{\circ} tan 35^{\circ} tan 45^{\circ} tan 55^{\circ} tan 70^{\circ} = 1

tan 20^{\circ} + 2 tan 50^{\circ} =

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