Theory of Intelligence
11TH•Mathematics•Trigonometric Identities•Question 3

(i)

Prove the following:

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(i)

sin⁡(180∘+α)sin⁡(90∘−α)=−sin⁡αcos⁡α\sin(180^\circ + \alpha)\sin(90^\circ - \alpha) = -\sin\alpha\cos\alpha

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(ii)
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