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" 18."quad (cos A-cos B)^(2)+(sin A-sin ...

" 18."quad (cos A-cos B)^(2)+(sin A-sin B)^(2)=4sin^(2)(A-B)/(2)

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to 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)((A-B)/(2))

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

sin^(2)A cos^(2)B-cos^(2)A sin^(2)B=sin^(2)A-sin^(2)B