If `A+B+c=180^0,\ ` then `s e c A(cos B cos C-sin B sin C)` is equal to `0` b. `-1` c. 1 d. none of these

If A+B+c=180^(@), then sec A(cos B cos C-sin B sin C) is equal to 0 b.-1 c.1d .none of these

A+B+C=180^(@)rArr SecA[cos B cos C-sin B sin C]

If A+B+C=180^(@) then the value of cosec A(sin B cos C+cos B sin C) is

If A + B + C = 180^(@) then P.T. cos A + cos (B - C) = 2 sin B sin C

A+B+C=18 0^(@)=>C o s e c A[Sin B cos C+ cos B sin c]=

If A+B+C=0, then the value of sin^(2)A+cos C(cos A cos B-cos C)+cos B(cos A cos C-cos B) is equal to: -1 (b) 0(c)1 (d) none of these

A+B+C=180^(@)rArr Cosec A[sin B cos C+cos B sin c]=

If A + B + C =180^@ , prove that : cos^2 A+ cos^2 B-cos^2 C= 1-2 sin A sin B cos C .

In a triangle ABC, if cos A cos B+sin A sin B sin C=1, then a:b:c is equal to

If A+B+C=180^(@)C then (sin 2A+sin 2B+sin 2C)/(cos A +cos B +cos C-1)=