Question

3 - cos 2 A+ 3 cos 2 A​

Answer 1

Step-by-step explanation:

7sin

2

x+3cos

2

x=4

4sin

2

x+3sin

2

x+3cos

2

x=4

4sin

2

x+3=4

4sin

2

x=1

sin

2

x=

4

1

sinx=

2

1

or sinx=−

2

1

Taking the positive root

x=

6

π

tan(

6

π

)=

3

1

Hence proved.

Hope its help..