CameraIcon
CameraIcon
SearchIcon
MyQuestionIcon
MyQuestionIcon
0
You visited us 0 times! Enjoying our articles? Unlock Full Access!
Question

If y=cos2x, then dydx=?


A

sin 2x

No worries! We‘ve got your back. Try BYJU‘S free classes today!
B

- sin 2x

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
C

2 cos x

No worries! We‘ve got your back. Try BYJU‘S free classes today!
D

none of these

No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution

The correct option is B

- sin 2x


y=(cosx)2
cosx = u ......(1)
dudx=sinx ......(2)
y=u2
dydx=dydu×dudx
=(2u)× (-sinx)
=(2cosx)(-sinx)
=-sin2x ( sin 2x=2sinx cosx )


flag
Suggest Corrections
thumbs-up
0
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
Differentiation
PHYSICS
Watch in App
Join BYJU'S Learning Program
CrossIcon