12th Class Mathematics Continuity and Differentiability

  • question_answer 142) Using is (A + B) = sin A cos B + cos A sin B and the differentiation obtain the sum formula for cosines. 

    Answer:

    sin (A + B) = sin A cos B + cos A sin B       Diff. w.r.t. A by taking B as a constant, we have                   cos (A + B) = cos A . cos B ? sin A . sin B       Hence the result.  


You need to login to perform this action.
You will be redirected in 3 sec spinner

Free
Videos