lim x tends to pi/2 cos3x + 3 cos x / ( pi /2 - x )^3 Share with your friends Share 1 Nishima Pasricha answered this @ Thundersam, Instead of writing cos(x)3, there must be cos3x. Otherwise, your answer is correct. Keep posting! -1 View Full Answer Rohit Goyal answered this Infinity -2 Thundersam answered this . 15