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f(x)=1-x/1+x
f(cos theta)=1-cos theta/1+cos theta -------(1)
we know the formula
1-cos theta =2sin²theta/2
1+cos theta =2cos² theta/2
substituting in 1 equation
2sin² theta /2/2cos²theta/2
=tan²theta/2
I HOPE THIS WILL HELP U
f(cos theta)=1-cos theta/1+cos theta -------(1)
we know the formula
1-cos theta =2sin²theta/2
1+cos theta =2cos² theta/2
substituting in 1 equation
2sin² theta /2/2cos²theta/2
=tan²theta/2
I HOPE THIS WILL HELP U
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