Limits

What happened in pointed step ?

@YouKnowwhere that is the infinite summation of GP, ie, a/(1r)

@SevenThree yeah i know but on putting x= 0 how sinx terms became 1/7 ,1/7 square and others....

@YouKnowwhere I think they have used the fact that at x> 0, sinx is approximately equal to x

@MohdsabirShaikh yeah may be but then also how they get one infinite GP summation from several infinite GP summations.

@YouKnowwhere In numerator, 1 and 1 cancels...so one x is taken common which cancels the x in the denominator....now limit is applied.....so denominator will be 1.

@MohdsabirShaikh but in numerator there are mang GPs but they take summation of only one
