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RBSE Solutions for Class 11 Maths Chapter 10 सीमा एवं अवकलज Ex 10.3

May 30, 2019 by Prasanna Leave a Comment

Rajasthan Board RBSE Class 11 Maths Chapter 10 सीमा एवं अवकलज Ex 10.3

प्रश्न 1.
x = 10 पर x² – 2 का अवकलज ज्ञात कीजिए।
हल-
यहाँ पर f(x) = x² – 2
हम जानते हैं कि
RBSE Solutions for Class 11 Maths Chapter 10 सीमा एवं अवकलज Ex 10.3

प्रश्न 2.
x = 50 पर 49x का अवकलज ज्ञात कीजिए।
हल-
∵ f(x) = 49x
RBSE Solutions for Class 11 Maths Chapter 10 सीमा एवं अवकलज Ex 10.3

प्रश्न 3.
प्रथम सिद्धान्त से निम्नलिखित फलनों के अवकलज ज्ञात कीजिए
RBSE Solutions for Class 11 Maths Chapter 10 सीमा एवं अवकलज Ex 10.3
हल-
(i) माना कि f(x) = x³ – 16
RBSE Solutions for Class 11 Maths Chapter 10 सीमा एवं अवकलज Ex 10.3

(ii) माना कि f (x) = (x – 1) (x – 2)
= x² – 2x – x + 2
= x² – 3x + 2
RBSE Solutions for Class 11 Maths Chapter 10 सीमा एवं अवकलज Ex 10.3

(iii) माना कि
RBSE Solutions for Class 11 Maths Chapter 10 सीमा एवं अवकलज Ex 10.3

(iv) माना कि
RBSE Solutions for Class 11 Maths Chapter 10 सीमा एवं अवकलज Ex 10.3

प्रश्न 4.
फलन
RBSE Solutions for Class 11 Maths Chapter 10 सीमा एवं अवकलज Ex 10.3
के लिए सिद्ध कीजिए कि
f’ (1) = 100 f'(0).
हल-
दिया गया है
RBSE Solutions for Class 11 Maths Chapter 10 सीमा एवं अवकलज Ex 10.3
∴ f'(1) = 1 + 1 + ….. + 1 + 1 = 100
∵ 100 पद है।
या f'(1) = 100 x 1 = 100 f’ (0) ∵ f'(0) = 1
अतः f'(1) = 100 f'(0) इतिसिद्धम्।

प्रश्न 5.
किसी अचर वास्तविक संख्या a के लिए
RBSE Solutions for Class 11 Maths Chapter 10 सीमा एवं अवकलज Ex 10.3
का अवकलज ज्ञात कीजिए।
हल-
माना कि
RBSE Solutions for Class 11 Maths Chapter 10 सीमा एवं अवकलज Ex 10.3

प्रश्न 6.
किन्हीं अचरों a और b के लिए,
(i) (x – a) (x – b)
(ii) (ax² + b)²
(iii) \(\frac { x-a }{ x-b }\) के अवकलज ज्ञात कीजिए।
हल-
(i) माना कि f(x) = (x – a) (x – b)
गुणन नियम का प्रयोग करने पर
RBSE Solutions for Class 11 Maths Chapter 10 सीमा एवं अवकलज Ex 10.3
= (x – a) [1 – 0] + (x – b) [1 – 0]
= (x – a) + (x – b)
= 2x – a – b

(ii) माना कि f(x) = (ax² + b)²
RBSE Solutions for Class 11 Maths Chapter 10 सीमा एवं अवकलज Ex 10.3
= (ax² + b) (2ax) + (ax² + b) (2ax)
= 4ax (ax² + b)

(iii) माना कि f(x) = \(\frac { x-a }{ x-b }\)
भागफल नियम का प्रयोग करने
RBSE Solutions for Class 11 Maths Chapter 10 सीमा एवं अवकलज Ex 10.3

प्रश्न 7.
किसी अचर a के लिए
RBSE Solutions for Class 11 Maths Chapter 10 सीमा एवं अवकलज Ex 10.3
का अवकलज ज्ञात कीजिए।
हल-
माना कि
RBSE Solutions for Class 11 Maths Chapter 10 सीमा एवं अवकलज Ex 10.3
भागफल नियम का प्रयोग करने पर
RBSE Solutions for Class 11 Maths Chapter 10 सीमा एवं अवकलज Ex 10.3

प्रश्न 8.
निम्नलिखित के अवकलज ज्ञात कीजिए
(i) 2x – \(\frac { 3 }{ 4 }\)
(ii) (5x³ + 3x – 1) (x – 1)
(iii) x5 (3 – 6x-9)
(iv) x-4 (3 – 4x-5)
(v) \(\frac { 2 }{ x+1 } -\frac { { x }^{ 2 } }{ 3x-1 } \)
हल-
(i) माना कि
RBSE Solutions for Class 11 Maths Chapter 10 सीमा एवं अवकलज Ex 10.3

(ii) माना कि f(x) = (5x3 + 3x – 1) (x – 1)
RBSE Solutions for Class 11 Maths Chapter 10 सीमा एवं अवकलज Ex 10.3
RBSE Solutions for Class 11 Maths Chapter 10 सीमा एवं अवकलज Ex 10.3
= (x – 1) [15x² + 3] + (5x³ + 3x – 1)
= 15x³ + 3x – 15x² – 3 + 5x³ + 3x – 1
= 20x3 – 15x² + 6x – 4

(iii) माना कि
RBSE Solutions for Class 11 Maths Chapter 10 सीमा एवं अवकलज Ex 10.3

(iv) माना कि
RBSE Solutions for Class 11 Maths Chapter 10 सीमा एवं अवकलज Ex 10.3

(v) माना कि
RBSE Solutions for Class 11 Maths Chapter 10 सीमा एवं अवकलज Ex 10.3

प्रश्न 9.
प्रथम सिद्धान्त से cos x का अवकलज ज्ञात कीजिए।
हल-
माना कि f (x) = cos x
RBSE Solutions for Class 11 Maths Chapter 10 सीमा एवं अवकलज Ex 10.3
= – sin x . 1
= – sin x

प्रश्न 10.
निम्नलिखित फलनों के अवकलज ज्ञात कीजिए
(i) sin x cos x
(ii) sec x
(iii) cosec x
(iv) 3 cot x + 5 cosec x
(vi) 5 sin x – 6 cos x + 7
हल-
(i) माना कि f(x) = sin x cos x
गुणन नियम का प्रयोग करने पर
RBSE Solutions for Class 11 Maths Chapter 10 सीमा एवं अवकलज Ex 10.3
= sin x (-sin x) + cos x (cos x)
= – sin² x + cos² x
= cos²x – sin²x
= cos 2x

(ii) माना कि f(x) = sec x
RBSE Solutions for Class 11 Maths Chapter 10 सीमा एवं अवकलज Ex 10.3
= sec x. tan x

(iii) माना कि f(x) = cosec x
RBSE Solutions for Class 11 Maths Chapter 10 सीमा एवं अवकलज Ex 10.3
= – cosec x . cot x

(iv) माना कि f(x) = 3 cot x + 5 cosec x
RBSE Solutions for Class 11 Maths Chapter 10 सीमा एवं अवकलज Ex 10.3
= – 3 cosec²x – 5 cosec x cot x

(v) माना कि f(x) = 5 sin x – 6 cos x + 7
RBSE Solutions for Class 11 Maths Chapter 10 सीमा एवं अवकलज Ex 10.3
= 5 cos x – 6 (- sin x) + 0
= 5 cos x + 6 sin x

RBSE Solutions for Class 11 Maths

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