Prove that
Cos³theta + sin³theta / cos theta + sin theta + cos³theta-sin³theta/ cos theta - sin theta =2
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14
Step-by-step explanation:
To Prove :
L.H.S. =
→
→
→
→ cos²θ + sin²θ - cosθsinθ + cos²θ + sin²θ + cosθsinθ
→ cos²θ + sin²θ + cos²θ + sin²θ
→ 2cos²θ + 2sin²θ
→ 2(cos²θ + sin²θ)
→ 2(1)
→ 2
= R.H.S.
Hence, proved !!
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