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Question

Solve:sin50cos40+csc40sec504cos50xcsc40.

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Solution

sin50sin40+cosec40sec504cos50cosec40
=sin50sin(9040)+cosec40cosec(9050)4cos50sec(9040)
=sin50sin50+cosec40cosec404cos50sec50
=1+14×1
=24
=2 =2

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