Join now for JEE/NEET and also prepare for Boards Join now for JEE/NEET and also prepare for Boards. Register Now
Hey there! We receieved your request
Stay Tuned as we are going to contact you within 1 Hour
One of our academic counsellors will contact you within 1 working day.
Click to Chat
1800-1023-196
+91-120-4616500
CART 0
Use Coupon: CART20 and get 20% off on all online Study Material
Welcome User
OR
LOGIN
Complete Your Registration (Step 2 of 2 )
Sit and relax as our customer representative will contact you within 1 business day
How to get the nth order derivative of y=cos3x*cos2x How to get the nth order derivative of y=cos3x*cos2x
Dear studentPlease find the link belowhttps://www.askiitians.com/forums/Trigonometry/find-the-nth-derivative-of-cos2x-cos3x-please_220963.htmRegards
Dear Rishika cos x cos 2x cos 3x = cos 2x [ cos 4x + cos 2x ] /2 =(1/2)[ cos 4x cos 2x + cos^2 2x] =(1/4) [cos 6x + cos 2x + ( 1 + cos 4x)] = (1/4) [ 1 + cos 2x + cos 4x + cos 6x ] Now we have D^n ( cos (ax + b) = a^n cos ( n pi/2 + ax + b). Thus, D^n( cos x cos 2x cos 3x ) = D^n [ (1/4) { 1 + cos 2x + cos 4x + cos 6x}] = (1/4) [ 2^n cos(n pi/2 + 2x) + 4^n cos ( n pi/2 + 4x) + 6^n cos( n pi/2 + 6x) ]
Dear , Preparing for entrance exams? Register yourself for the free demo class from askiitians.
points won -