prove that 1/sina + cos a /sin a =cosec a
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Answer:
sinA1+cosA+1+cosAsinA
=sinA.sinA+(1+cosA).(1+cosA)sinA(1+cosA)
=sin2A+1+cos2A+2cosAsinA(1+cosA)
=2+2cosAsinA(1+cosA)
=2(1+cosA)sinA(1+cosA)
=2sinA
=2 cscA
sinA1+cosA+1+cosAsinA=2cscA
Note:
sin2A+cos2A=1
sinA=1cscA
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