# If A + B = 90 then prove tha .

Formula: -

(i) cot(90 - a) = tana

(i) sina.coseca = 1

(iii) sin(90° – a) = cosa

LHS.

we know that, A + B = 90° B = A – 90°

L.H.S = R.H.S

Hence, Proved.

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