Q24 of 43 Page 5

If , find .

OR


If and , find when .  (CBSE 2018)

Given:  

Expanding by the formula: (a + b)2 = a2 + b2 + 2ab

Differentiating with respect to x,






OR


,


∴


,


Now




at π/3,

∴.

More from this chapter

All 43 →
22

Determine the value of ‘k’ for which the following function is continuous at x = 3:

  (CBSE 2017)

 23

If sin2y + cosxy = k, find at x = 1,   (CBSE 2017)

 25

If sin y = x cos (a + y), then show that

Also, show that , when x = 0.  (CBSE 2018)

26

If prove that  (CBSE 2011)