The value of `cos e c10^0+cos e c50^0-cos e c70^0` is ____

The value of cot70^0+4cos70^0 is

The value of cos^2 10^0-cos10^0cos50^0+cos^2 50^0 is equal to

cos e c(360^0)/7 + cos e c(540^0)/7

The value of 16cos 10^(@) cos30^(@) cos50^(@)cos70^(@) "is"

Find the value of cos12^0+cos84^0+cos156^0+cos132^0

Find the value of x for which cos e c^(-1)(cosx) is defined.

Find the least value of sec^6x+cos e c^6x+sec^6xcos e c^6xdot

If A+C=2b, then the value of (cos C - cos A)/(sin A-sin C) is-

If A+C+B=180, then the value of (cos ^(2) A+ cos ^(2) B +cos ^(2) C-2 cos A cos B cos C) is-

If |{:(1,cos alpha, cos beta),(cos alpha, 1 , cos gamma ),(cos beta, cos gamma , 1):}|=|{:(0,cos alpha, cos beta),(cos alpha , 0 , cos gamma),(cos beta, cos gamma, 0):}| then the value of cos^2 alpha + cos^2 beta + cos^2 gamma is : (a) 1 (b) 1/2 (c) 3/8 (d) 9/4