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

(ii)

Prove the following:

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(ii)

sin⁡810∘sin⁡630∘+cos⁡135∘sin⁡225∘=−12\sin 810^\circ \sin 630^\circ + \cos 135^\circ \sin 225^\circ = -\dfrac{1}{2}

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