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January 31, 2015

January 31, 2015

Posted by **Abhi** on Thursday, June 14, 2012 at 1:43pm.

- Maths -
**MathMate**, Thursday, June 14, 2012 at 5:44pmHint:

write equation as:

tan(a)=(x²-y²)/(x²+y²)

Cross multiply to eliminate denominators:

(x²+y²)tan(a)=(x²-y²)

Implicitly differentiate both sides

(2x+2yy')tan(a) = 2x-2yy'

Group terms and express y'(=dy/dx) in terms of x, y and tan(a) to get the required expression.

- Maths -
**abhi**, Tuesday, September 18, 2012 at 9:30amThanku soo much

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