cos A + cos B = 2 then the value of cos (A+B)
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Sin A + Sin B=2 is only possible if both the sin functions have maximum value i.e 1.
Which means Sin A=1 and Sin B=1.
Therefore, A=pi/2, B=pi/2.
Cos A= Cos (pi/2)= 0.
Similarly, Cos B=0.
Therefore, Cos A + Cos B=0.
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