how to solve....i am unable to solve even after applying the formula
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Step-by-step explanation:
Your answer is one .
Approach : A+B+C+D = 2π
A+B = 2π - (C+D)
Applying Cos function to both sides,
CosACosB - SinASinB = Cos[2π - (C+D)]
CosACosB - SinASinB = Cos(C+D)
CosACosB - SinASinB = CosC*CosD - SinC*SinD
CosACosB + SinC*SinD
= CosC*CosD + SinASinB
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