Prove each of the following identities:
Consider L.H.S. = 
= 
= 
= sin θ cos θ × 
= sin θ cos θ × 
= sin θ cos θ × 
= sin θ cos θ × 
= sin θ cos θ × 
= sin θ cos θ/ sin θ cos θ
= 1
= R.H.S.
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