(cosec A - sin A) (sec A - cos A) sec? A = tan A.
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Step-by-step explanation:
put power 2 in place of question mark(?)
=(1/sinA - sinA)(1/cosA - cosA) sec^2A
=(1-sin^2A/sinA) (1-cos^2A/cosA) sec^2A
=(cos^2A/sinA)(sin^2A/cosA) sec^2A
=cosA*sinA*sec^2A
=cosA*sinA*1/cos^2A
=sinA/cosA
=tanA
Hence proved
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