# Differentiate Each of the Following from First Principle: 3 X 2 - Mathematics

Differentiate each of the following from first principle:

$3^{x^2}$

#### Solution

$\frac{d}{dx}\left( f(x) \right) = \lim_{h \to 0} \frac{f\left( x + h \right) - f\left( x \right)}{h}$
\frac{d}{dx}\left( 3^{x^2} \right) = \lim_{h \to 0} \frac{3^\left( x + h \right)^2 - 3^{x^2}}{h}
$= \lim_{h \to 0} \frac{3^{x^2 + 2xh + h^2} - 3^{x^2}}{h}$
$= \lim_{h \to 0} \frac{3^{x^2} \left( 3^{x^2 + 2xh + h^2 - x^2} - 1 \right)}{h} \times \frac{\left( h + 2x \right)}{\left( h + 2x \right)}$
$= 3^{x^2} \lim_{h \to 0} \frac{3^{h\left( h + 2x \right)} - 1}{h\left( h + 2x \right)} \lim_{h \to 0} \left( h + 2x \right)$
$= 3^{x^2} \log 3 \left( 2x \right)$
$= 2x 3^{x^2} \log 3$


Concept: The Concept of Derivative - Algebra of Derivative of Functions
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#### APPEARS IN

RD Sharma Class 11 Mathematics Textbook
Chapter 30 Derivatives
Exercise 30.2 | Q 3.12 | Page 26

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