Question

If 4cos^2 x = 3 and x is an acute angle , find (i) cos 3x (ii) sin 2x (iii) cos^2 x + cot^2 x

(note: cos 3x when x is an angle= 3×angle x. similarly sin 2x= 2×angle x)​

Answer 1

Step-by-step explanation:

4cos

2

x=3

cos

2

x=

4

3

cosx=

2

3

cosx=cos30

x=30

∘

cos3x=cos90=0