In ABC, sin^2(A2) sin^2(B2) +sin^2(C2)+ 2cos(A2) sin(B2) cos(C2)= k then the value of k is - Maths - Trigonometric Functions

Question

In ?ABC, sin^2(A2) ?sin^2(B2) +sin^2(C2)+ 2cos(A2) sin(B2) cos(C2)=
k then the value of k is

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In ?ABC, sin^2(A2) ?sin^2(B2) +sin^2(C2)+ 2cos(A2) sin(B2) cos(C2)= k then the value of k is