1.

Prove that: (i)cos11∘+sin11∘cos11∘−sin11∘=tan56∘ (ii)cos9∘+sin9∘cos9∘−sin9∘=tan54∘ (iii)cos8∘−sin8∘cos8∘+sin8∘=tan37∘

Answer»

Prove that:
(i)cos11+sin11cos11sin11=tan56
(ii)cos9+sin9cos9sin9=tan54
(iii)cos8sin8cos8+sin8=tan37



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