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" 10."(cos A+cos B)^(2)+(sin A+sin B)^(2...

" 10."(cos A+cos B)^(2)+(sin A+sin B)^(2)=4cos^(2)(1)/(2)(A-B)

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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)=4sin^(2)((A-B)/(2))

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) = 4 cos ^(2) ((A -B)/(2)).

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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)=4sin^(2)backslash(A-B)/(2)

Show that (1+ sin A)/(cosA)+( cos B)/(1- sin B)=(2 (sin A- sin B))/(sin (A-B)+ cos A-cos B)