if (sin theta + cos theta)=a and (sin theta - cos theta)=b find (a+b)(a-b)
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Answer:
cos theta)=b find (a+b)(a-b)
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Answer:
4sinθcosθ
Step-by-step explanation:
(a+b)(a-b) = a²-b²
⇒ (sinθ+cosθ)² - (sinθ-cosθ)²
⇒ sin²θ + cos²θ + 2sinθcosθ - (sin²θ + cos²θ - 2sinθcosθ)
⇒ 4sinθcosθ
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