Question

prove that..
please someone help!!​

Answer 1

Answer:

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Answer 2

Let

sin = a

cos = b

We know ,

a³ + b³ = ( a + b)( a² + b² - ab)

So,

sin³ + cos³

= ( sin + cos )(sin² + cos² - sin.cos )

= ( sin + cos )( 1 - sin.cos ) ; [ sin² + cos² = 1 ]

Hence ,

LHS = RHS