Question

(viii) Prove that
cos (90° - theta) cos theta / cot theta = 1 - cos square theta​

Answer 1

Answer:

cos(90-theta)cos theta/ cos theta

since cos (90-theta)= -cos theta = cos theta

cos theta * cos theta / cos theta

one cos theta get cancelled in numerator with denominator

we know cos2 theta = 1-2cos square theta, similarly

cos theta= 1-cos square theta

hence proved

Answer 2

Answer:

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