If cos20^@ - sin 20^@ = p, then cos 40^@...

If `cos20^@ - sin 20^@ = p`, then `cos 40^@` is equal to

A

`p^2sqrt(2-p^2)`

B

`psqrt(2-p^2)`

C

`p+sqrt(2-p^2)`

D

`p-sqrt(2-p^2)`

Text Solution

Verified by Experts

The correct Answer is:

B

Promotional Banner

Promotional Banner

Recommended Questions

If cos20^@ - sin 20^@ = p, then cos 40^@ is equal to
Text Solution
|
If cos20-sin20=p, then cos40 is equal to
Text Solution
|
The value of cos^(2)20^(@)sin^(2)100^(@)+cos20^(@)cos100^(@) is -
Text Solution
|
4 (cos ^ (3) 20 ^ (@) + cos ^ (3) 40 ^ (@)) = 3 (cos20 ^ (@) + cos40 ^...
Text Solution
|
Given that cos20^(@)-sin20^(@)=p , then what is the value of sin 40^(...
Text Solution
|
[(sin 20^(@), -cos20^(@)),(sin70^(@), cos70^(@))]=?
Text Solution
|
cos 40^(@) cos 20^(@) -sin 40^(@) sin 20^(@)=
Text Solution
|
यदि cos 20^(@)-sin 20^(@)=p हो, तो cos 40^(@) का मान होगा-
Text Solution
|
Prove that, (cos30^(@) - sin 20^(@))/(cos 40^(@) + cos20^(@)) = 4/sqrt...
Text Solution
|