फलन के प्रतिअवकलज (समाकलन) निरीक्षण विधि द्वारा ज्ञात कीजिए। cos 3x
Exercise-7.1-2
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$\int \cos 3 x d x=\frac{1}{3} \sin 3 x$ [$\because$ $\frac{d}{d x}\left(\frac{1}{3} \sin 3 x\right)$ $=\frac{1}{3}$ (cos 3x)3 = cos 3x]
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