sin/sin(90-theta) +cos/cos(90-theta) =sec. cosec
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LHS = sin/cos + cos/sin
= sin^2 +cos^2/sin + cos
= 1/sin +cos
= 1/sin +1/cos
= cosec +sec
= sin^2 +cos^2/sin + cos
= 1/sin +cos
= 1/sin +1/cos
= cosec +sec
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