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Question

Prove that, 1+cosAsinA=sinA1-cosA


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Solution

In 1+cosAsinA=sinA1-cosA,

L.H.S=1+cosAsinA

Multiplying and dividing the L.H.S by 1-cosA we get,

1+cosAsinA=1+cosAsinAƗ1-cosA1-cosA

=1-cos2AsinA1-cosAā€¦ā€¦ā€¦ā€¦ā€¦ā€¦ā€¦ā€¦ā€¦ā€¦ā€¦āˆµa+ba-b=a2-b2

=sin2AsinA1-cosAā€¦ā€¦ā€¦ā€¦ā€¦ā€¦ā€¦ā€¦ā€¦ā€¦.āˆµsin2A+cos2A=1

=sinA1-cosA

=R.H.S

Hence, it is proved that 1+cosAsinA=sinA1-cosA


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