2 years ago

(1 - cos ß)(1 + cos ß) =1/cosec^2(ß)

Mathematics

1 answer:

iVinArrow [24]2 years ago

5 0

Step-by-step explanation:

L.H.S=(1-cosB)(1+cosB)

=(1-cos^2B). {using (a+b) (a-b)=(a^2-b^2)in second step}

=sin^2B

=1/cosec^2B

Therefore,L.H.S=R.H.S proved

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