there are so many formulas in circles lik the formula for chord of contact, power of a point, equation of a pair of tangents etc. please tell me how to drive them so that i can easily learn them

Dear Himanshu,

Instaed of grasping these formula try to memorize the procedur of their derivation,

This will also help in solving many problems

Also do as much written practice as possible.

 BEST OF LUCK..!!!!

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