Home
Class 11
MATHS
Prove that cos 6^(@) cos 42^(@) cos 66...

Prove that `cos 6^(@) cos 42^(@) cos 66^(@) cos 78^(@) =(1)/(16)`

Text Solution

Verified by Experts

`LHS= (sin 6^(@) sin 42^(@) sin 66^(@) sin78^(@))/(cos 6^(@) cos 42^(@) cos 66^(@) cos 78^(@))`
Promotional Banner

Topper's Solved these Questions

  • TRIGONOMETRIC , OR CIRCULAR, FUNCTIONS

    RS AGGARWAL|Exercise Exercise (15E)|10 Videos

  • TRIGONOMETRIC , OR CIRCULAR, FUNCTIONS

    RS AGGARWAL|Exercise Exercise (15C)|27 Videos

  • THREE-DIMENSIONAL GEOMETRY

    RS AGGARWAL|Exercise EXERCISE 26 C|13 Videos

  • TRIGONOMETRIC EQUATIONS

    RS AGGARWAL|Exercise EXERCISE|21 Videos

Similar Questions

Explore conceptually related problems

Prove that sin 6^(@) sin 42^(@) sin 66^(@) sin 78^(@) = (1)/(16) .

Prove that cos6^(@)*cos42^(@)*cos66^(@)cos78^(@)=(1)/(16)

Prove that cos 36^(@) cos 72^(@) cos 108^(@) cos 144^(@)=1//16 .

4cos6^(@)cos42^(@)cos60^(@)cos78^(@)=

Prove that cos 20^(@)cos40^(@)cos60^(@)cos80^(@)=(1)/(16)

cos20 ^ (@) cos40 ^ (@) cos60 ^ (@) cos80 ^ (@) - (1) / (16) =

Prove that :cos20^(@)cos40^(@)cos60^(@)cos80^(@)=(1)/(16)

Prove that: cos20^(@)cos40^(@)cos60^(@)cos80^(@)=(1)/(16)