sin50/cos40 + cosec70/sec20 - 2cos70cosec20 = 0
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Answer:
LHS : sin50/cos40 + cosec70/sec20-2cos70cosec20
= sin(90-40)/cos40 + cosec70/sec(90-70)-2cos70*1/sin20
= cos40/cos40 + cosec70/cosec70-2cos 70/sin(90-70)
= 1 + 1 - 2cos70/sin70
=2-2
=0
= RHS
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