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Problem on limits

B.Sudhakar
23/01/2017 0 0

Find    lim x→0 ( sin 4x )/( x )

To use standard trig formula on limits, lim x→0 (sin x )/( x ) = 1 let us multiply numerator and denominator by 4.

= lim x→0 ( sin 4x ) • ( 4 ) / ( 4 • x )

= lim x→0  ( 4 ) • ( sin 4x )/ ( 4x ).    ( taking constant 4 outside the limit )

= 4 lim x→0 ( sin 4x )/( 4x )

= 4 • 1 = 4

∴ lim x→0 ( sin 4x )/ ( x ) = 4

 

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