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May 29, 2016
Posted by **pooja** on Saturday, April 30, 2011 at 7:53am.

- maths -
**MathMate**, Saturday, April 30, 2011 at 9:43amExpand both sides using sum of angles formula:

cos(a+b)=cos(a)cos(b)-sin(a)sin(b)

cos(a-b)=cos(a)cos(b)+sin(a)sin(b)

Divide by cos(a) on both sides and solve for tan(a) to get:

tan(a)=cot(b)*(1-m)/(1+m)

Check me.