Disguise its all that matters !!!!!!

Calculus Level pending

Calculate the absolute value of the limit given below. $$\Xi=\lim_{h \to 0} \dfrac{\sin h + \sin 2h+ \sin 3h \cdots + \sin 3\pi}{\cos h +\cos 2h +\cos 3h \cdots + \cos \dfrac{3\pi}{2}}$$.

Hint: Take a look at this.

×