One of the most important and exam oriented question from trigonometry, topic – trigonometric identities in which we have been asked to find the value of sinθcos(90°-θ) + cosθsin(90°-θ)
RS Aggarwal, Class 10, chapter 13C, question no 7
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sinθ cos(90-θ) + cosθ sin(90-θ)
= sinθsinθ + cosθcosθ
= sin²θ + cos²θ
= 1