Prove the following:

cos(90–θ ) = sinθ
tan(90–θ ) = cotθ
sin(90–θ ) = cosθ
cot(90–θ ) = tanθ
cosec(90–θ ) = secθ
sec(90–θ) = cosecθ
L.H.S
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— 2cos70 cosec20 = 0
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