you just need to use the expansion of sin x n cos x such that the value of the function at the critical value must be defined at all the piece wise defined functions.
Best of Luck in advance
Provide a better Answer & Earn Cool Goodies
LIVE ONLINE CLASSES
Prepraring for the competition made easy just by live online class.
Full Live Access
Study Material
Live Doubts Solving
Daily Class Assignments
Ask a Doubt
Get your questions answered by the expert for free