Question

4sin^2x + sin 2x -2 = 0 ? values of X ?

Answer 1

Let u = sin x
And things should clear up a bit.

Answer 2

but how to make that for sin 2x ?

Answer 3

I just saw... hang on, I'm thinking...

Answer 4

okay

Answer 5

the ques was sin2x = 2 cos 2x , but i did until i got that answer

Answer 6

I don't know how you got there from the original question, but you realise that this all boils down to

tan 2x = 2
right?

Answer 7

i got there from cos 2x = 1-2sin^2 x

Answer 8

Yes, I can see it now. However, all you had to do was divide both sides of the equation by cos 2x
you should arrive at
tan 2x = 2.

Answer 9

omg ! that is so true . haha . im on my semester break . brain is freezing ! :( THANKS2!