Sir i didn't understand how can we similarly prove that AB/DE= BC/EF

xcos (a+y)=cosy, Hence prove, y'=cos^2(a+y) / sina

28.5-30=(60-6x) /15

Sir in this question can't we use PE/PQ =PF/FR and why not?

PLEASE clear me with this one

how is the side of rectangle be negative in this question?

Is this all important ques of class 9 8th ch

taylor series

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