Posted by mien on Wednesday, February 1, 2012 at 7:28am.
secØ - tanØsinØ = cosØ
LS (left side)
= 1/cosØ - (sinØ/cosØ)sinØ
= (1 - sin^2 Ø)/cosØ
= cos^2 Ø/cosØ
= cosØ
= RS
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