যদি cosA + cosB = 1/3 এবং sinA +sinB = 1/4 হয় তবে দেখাও যে, tanA+B /2 =3/4
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Sin A + Sin B= 1/4 .....1
Cos A + Cos B=1/3 .....2
dividing 1 by 2
Sin A/Cos A + Sin B / Cos B=1/4÷1/3
Tan A + Tan B= 3/4
Tan (A+B)=3/4
Tan (A+B)/2=3/4
Tan (A+B)/2=3/2
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