Integration of ( )
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Solution:
Now,
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We consider, tanx = z²
⇒ sec²x dx = 2z dz
⇒ (1 + tan²x) dx = 2z dz
⇒ (1 + z²) dx = 2z dz
⇒ dx = 2z dz /(1 + z²)
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= 2z + C , where C is integral constant
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