guys please help class 10 maths .
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(1-cosA)/(1+cosA)
divide and multiply with 1-cosA
=(1-cosA)(1-cosA)/(1+cosA)(1-cosA)
=(1-cosA)^2/(1-(cosA)^2)
=(1-cosA)^2/(sinA)^2
=((1-cosA)/(sinA))^2
=(cosecA-cotA)^2
=(cotA-cosecA)^2
hope this helps you
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