evaluate sin50°/cos40° + cosec40°/sec50° -4cos50°cosec40°
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=sin50/cos40+cosec40/sec50-4cos50cosec40
=sin(90-40)/cos40/cosec(90-40)-4cos50cosec(90-50)
=cos40/cos40+sec50/sec50-4cos50×1/cos50
=1+1-4
=2-4
=-2
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