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What is componendo and dividendo method? Plz explain.

The chapter trigonometry in RS Aggarwal book (of class 11th) is divided into 6 sub-chapters. But its chapter 5 ( Solution of triangles ) and 6 ( Graphs of trigonometric functions ) are not the topics of NCERT Book.

Now my question is:

Should I study these two chapters (5 &6 of RS Aggarwal) as these are not in NCERT Book?The equation of a curve whose slope at any point is thrice its abscissa and which passes through (-1,-3) is

(A) y=x

^{2}-4(B) 3y= 2(x

^{2}- 4)(C) 2y=3(x

^{2}-3)(D) None of these