Question

3) Find value of x if Cos’x + 5 Sinx.Cosx = 3

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Answer 1

Answer:

X = 30°

Step-by-step explanation:

cos^2x + 5sin(90-x)cosx 3

cos^2x + 5cosx.cosx = 3

cos^2x + 5cos^2x = 3

6cos^2x = 3

cos2x = 3/6

cos^2x = 1/2

Cosx = 1/2

cosx = 1/2

X = 30°

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