Prove that: span class=math inline\(\tan\left( 70^{\circ} \right) = tan\left( 20^{\circ} \right)...
Prove that: span class=math inline\(\tan\left( 70^{\circ} \right) = tan\left( 20^{\circ} \right)+2tan\left( 50^{\circ} \right)\)/span
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