[ln ash BC(2)/((cos A+cos B cos C))" is equal to "],[[" (A) "b^(2)+c^(2)," (B) "bc," (C) "a^(2)]]

In a Delta ABC(bc sin^(2)A)/(cos A+cos B cos C) is equal to

In any ABC,2(bc cos A+ca cos B+ab cos C)=

If A+B+C=3pi/2 . Then cos 2A +cos 2B+cos2C is equal to

In a Delta ABC,a(cos^(2)B+cos^(2)C)+cos A(c cos C+b cos B) is equal to

If A+B+C =(3pi)/(2) , then cos2A+cos2B+cos2C is equal to-

In a Delta ABC if (cos A)/(b cos C+c cos B)+(cos B)/(c cos A+a cos C)+(cos C)/(a cos B+b cos A)=(a^(2)+b^(2)+c^(2))/(Kabc) then K^(k) is equal to

If A+B+C =pi, then cos ^(2) A+ cos ^(2)B - cos^(2) C is equal to