Question

If 2sin60°. cos10° = cosA + cosB. Then find the value of B ?​

Answer 1

We know that-

2cosX cosY = cos(X+Y) + cos(X-Y)

Now,

2cos60°cos 10º = cosA + cosB

⇒ cosA + cosB = Cos(60+10)° + cos(60-10)°

⇒ cosA + cosB = Cos(70)° + cos(50)°

∴ On compairing both sides of the equation, we get

A = 70° ; B = 50°

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Answer 2

Step-by-step explanation:

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