Question

2cos3A=1 then A=? please

Answer 1

Answer:

10

Step-by-step explanation:

Cos3A=1/2

3A=60

A= 20

Answer 2

Answer:

A = 20°

2Cos 3A = 1

Cos 3A=$\frac{1}{2}$

we know that the value of cos60 is $\frac{1}{2}$

cos3A = cos60°

3A = 60°

A = $\frac{60}{3}$

A =20°

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