यदि sinx+siny=0=cosx+cosy हो, तब cos2x+c...

यदि `sinx+siny=0=cosx+cosy` हो, तब `cos2x+cos2y` समान होगा

A

`-2 sin ( x + y)`

B

`-2 cos ( x + y)`

C

`2 sin (x + y)`

D

`2 cos ( x + y)`

लिखित उत्तर

Verified by Experts

The correct Answer is:

B

Promotional Banner

Promotional Banner

Recommended Questions

यदि sinx+siny=0=cosx+cosy हो, तब cos2x+cos2y समान होगा
Text Solution
|
If sinx+siny+sinz=cosx+cosy+cosz=0, then (A) sin2x+sin2y+sin2z=0 (B) c...
Text Solution
|
If sinx+siny=sqrt(3)(cosy-cosx), then (sin3x+sin3y)=?
Text Solution
|
(cosx-cosy)^(2)+(sinx-siny)^(2)=?
Text Solution
|
(sinx-siny)/(cosx+cosy)=tan(x-y)/(2)
Text Solution
|
e^(x-y)(sinx+cosx)dx+(cosy-siny)dy=0
Text Solution
|
The solution of the differential equation cosx siny dx+sinx cosy dy=0...
Text Solution
|
cosx(1+cosy)dx-siny(1+sinx)dy=0
Text Solution
|
If cosx+cosy+cosz=sinx+siny+sinz=0" then "cos(x-y)=
Text Solution
|