साबित करें कि
`( cos A + cos B )^(2) + ( sin A + sin B )^(2) = 4 cos^(2) . ( A-B)/(2)`

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Prove that (cos A + cos B ) ^(2) +(sin A + sin B) ^(2) = 4 cos ^(2) ((A -B)/(2)).

Prove that (cos A + cos B ) ^(2) +(sin A + sin B) ^(2) = 4 cos ^(2) ((A +B)/(2)).

Prove that, (cos A + cos B)^(2)+(sin A + sin B)^(2)=4cos^ (2)((A-B)/(2))

Prove that (cos A - cos B) ^(2) + (sin A - sin B ) ^(2) = 4 sin ^(2) ((A -B)/( 2 )).

Prove that: (cos A+cos B)^(2)+(sin A+sin B)^(2)=4cos^(2)backslash(A-B)/(2)

Prove that: (cos A+cos B)^(2)+(sin A-sin B)^(2)=4cos^(2)((A+B)/(2))

Prove that (cos A-cos B)^(2)+(sin A-sin B)^(2)=4sin^(2)((A-B)/(2))

Prove that: (cos A-cos B)^(2)+(sin A-sin B)^(2)=4sin^(2)backslash(A-B)/(2)

to prove that (cos A-cos B)^(2)+(sin A-sin B)^(2)=4sin^(2)((A-B)/(2))

cos A = a cos B, sin A = b sin B rArr (b ^ (2) -a ^ (2)) sin ^ (2) B =