Home
Class 12
MATHS
cos 20^@.cos 40^@.cos 60^@ cos 80^@= a)1...

`cos 20^@.cos 40^@.cos 60^@ cos 80^@=` a)`1/16` b)`3/16` c)`sqrt3/16` d)`sqrt3/32`

A

`1/16`

B

`3/16`

C

`sqrt3/16`

D

`sqrt3/32`

Text Solution

Verified by Experts

The correct Answer is:
A
Promotional Banner

Similar Questions

Explore conceptually related problems

cos20^@cos40^@cos80^@=

Prove the following: cos20^@cos40^@cos60^@cos80^@=1/16

The value of cos20^@cos40^@cos60^@cos80^@ is equal to

The value of cos 20^(@) cos 40^(@)cos 60^(@) cos 80^(@) is equal to .............. A) 1/16 B) 3/16 C) (sqrt3)/(16) D) (sqrt3)/(32)

cos 20^(@) cos 40^(@) cos 80^(@)= ............ A) 1/2 B) 1/4 C) 1/6 D) 1/8

Prove the following: sin20^@sin40^@sin60^@sin80^@=3/16

sin 20^(@) sin 40^(@) sin 60^(@) sin 80^(@) = .............. A) (-3)/(16) B) (5)/(16) C) (3)/(16) D) (-5)/(16)

The value of sin 600^(@) cos 330^(@)+ cos 120^(@) sin 150^(@) is ............... A) -1 B) 1 C) (1)/(sqrt2) D) (sqrt3)/(2)

The value of sin 10^(@) sin 30^(@) sin 50^(@) sin 70^(@) is.............. A) 1/8 B) 1/16 C) (sqrt3)/(8) D) (sqrt3)/(16)

1+ cos 10^(@) + cos 20^(@)+ cos 30^(@)= ............... A) 4 cos 5^(@) cos 10^(@) cos 15^(@) B) 4 cos 10^(@) cos 20^(@) cos 30^(@) C) 4 sin 5^(@) sin 10^(@) sin 15^(@) D) 4 sin 10^(@) sin 20^(@) sin 30^(@)