x → 0 lim tan 3 x − tan 2 x sin ( 3 x ) + sin ( 2 x )
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this problem is very easy.. divide numerator and denominater by x.then use standard limits sin(nx) by x as x tends to zero..
This is level 5...?
I just applied L-H rule once to get that..
The above limit can be written as:
d x d ( t a n 3 x − t a n 2 x ) d x d ( s i n 3 x + s i n 2 x )
( 3 s e c ² 3 x − 2 s e c ² 2 x ) ( 3 c o s 3 x + 2 c o s 2 x )
Which on applying limit x --> 0 gives (3+2)/(3-2) = 5
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As x approaches 0, we have 3 x − 2 x 3 x + 2 x = 3 − 2 3 + 2 = 5 . Remember that for extremely small x , both s i n x and t a n x approach x .