What is the value of 2cos(a+b)+2cos(a-b)
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Step-by-step explanation:
Cos ( a + b ) = CosA.CosB - SinA.SinB
Cos ( a - b ) = CosA.CosB + SinA.SinB
2 Cos (a+b) + 2 Cos (a-b) = 2CosACosB - 2SinASinB + 2CosACosB + 2SinAsinB
= 4CosACosB
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