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CLASS_11_MATHS_SOLUTIONS_NCERT

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Class XI Chapter 13 – Limits and Derivatives Maths<br />

______________________________________________________________________________<br />

By quotient rule,<br />

f<br />

<br />

1 sin x cos xcos x 1<br />

sin x<br />

' x<br />

dx<br />

dx<br />

2<br />

1<br />

sin x<br />

1 sin xsin x cos xcos<br />

x<br />

2<br />

1<br />

sin x<br />

<br />

<br />

<br />

<br />

2 2<br />

x x x<br />

2<br />

sin sin cos<br />

<br />

1sin<br />

x<br />

<br />

<br />

<br />

2 2<br />

x x x<br />

sin sin cos<br />

<br />

2<br />

1sin<br />

x<br />

sin x 1<br />

<br />

1 sin x<br />

<br />

1sin<br />

1sin<br />

x<br />

1<br />

<br />

1 sin x<br />

2<br />

<br />

x<br />

2<br />

<br />

<br />

<br />

<br />

d<br />

<br />

d<br />

Question 17:<br />

Find the derivative of the following functions (it is to be understood that a, b, c, d, p, q, r and s<br />

are fixed non zero constants and m and n are integers): sin x<br />

cos x<br />

sin xcos<br />

x<br />

Solution 17:<br />

Let f (x) = sin x<br />

cos x<br />

sin xcos<br />

x<br />

By quotient rule,<br />

f<br />

<br />

<br />

d<br />

sin x cos x sin x cos xsin x cos x sin x cos<br />

x<br />

' x<br />

<br />

dx<br />

dx<br />

2<br />

sin<br />

xcos<br />

x<br />

sin x cos xcos x sin xsin x cos xcos x sin<br />

x<br />

2<br />

sin<br />

xcos<br />

x<br />

2 2<br />

sin x cos x sin x cos<br />

x<br />

2<br />

sin<br />

xcos<br />

x<br />

d<br />

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