Question

11)
18) if cosa = 0.4 then cos 3A =?​

Answer 1

Given :-

• cos A = 0.4

To Find :-

• cos 3A = ?

Solution :-

we know that,

• cos 3A = 4•cos³A - 3•cos A .

so, putting given value of cos A , we get,

→ cos 3A = 4•cos³A - 3•cos A

→ cos 3A = 4*(0.4)³ - 3*(0.4)

→ cos 3A = 4*(0.064) - 1.2

→ cos 3A = 0.256 - 1.2

→ cos 3A = (-0.944) (Ans.)

Answer 2

Answer:

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