prove that sin 70 / cos 20 + cosec 20/ sec 70 - 2 cos 70 - cosec 20 = 0 prove it
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Sin70/cos 20+cosec20/sec70
-2cos70*cosec20
=Sin(90-70)/cos20 + cosec20(90-20)/sec70 - 2 cos70 * cosec (90-20)
=cos20/cos20 + sec 70 / sec 70
-2*cos70*sec70
=1+1-2cos70*1/cos70
=2-2*1
=2-2=0
Hence proved
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