Question

put the equation : 7 sin^2(x)- (4sin2(x))/(cos(x)) = -1
into a standard quadratic trigonometric equation.

Can I use some identites so make the equation moer neat?

Answer 1

why does sin(2) x mean?

Answer 2

is that suppose to be sin(2) times x
or sin(2 times x)

Answer 3

Might be a typo

Answer 4

or sin^2(x)

Answer 5

two times x

Answer 6

look at the image i attached

Answer 7

sin(2) * x?

Answer 8

typo its supposed to be twice the angle

Answer 9

I am looking at the image
l

Answer 10

its supposed to be the image times two*

Answer 11

angle times two*

Answer 12

double angle

Answer 13

do you know the double angle identity for sin(2x)?

Answer 14

2sinxcosx

Answer 15

right guess what happens when you have cos(x)/cos(x)

Answer 16

1

Answer 17

ahhhhhhhhhhhh

Answer 18

\[7 \sin^2(x)-4 \cdot 2\sin(x)+1=0\]

Answer 19

I geti tinoq

Answer 20

thanks a million

Answer 21

np

Answer 22

you cant multiply out the 4 * 2 sin x to make it 8 sinx right?