Prove that
(Cos³+ sin³/cos + sin) + (cos³- sin³/cos - sin) = 2
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(Cos³+ sin³/cos + sin) + (cos³- sin³/cos - sin) = 2
= by using id. = a³+b³ in First Term and a³-b³ in Second Term
= (cosФ + sinФ) ( cos²Ф+sin²Ф-cosФsinФ) +
(cosФ + sinФ)
(cosФ-sinФ)( cos²Ф+sin²Ф+ cos ФsinФ)
(cosФ-sinФ)
= 1 - cosФsinФ + 1 +cosФsinФ
= 2
=RHS
Hence Prove
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