The Student Room Group
First of all, wrong forum.

Do you know the tan double angle formula?
Reply 2
milliondollarcorpse
First of all, wrong forum.

Do you know the tan double angle formula?

tan2x= 2tanx/(1-tan^2 x)?
Flint_09
tan2x= 2tanx/(1-tan^2 x)?

Yep. Now let that equal to one and solve for tanx (it'll be a quadratic)
Reply 4
i don't get the quadratic
Reply 5
2sinxcosx=cos^2 x - sin^2 x
Flint_09
i don't get the quadratic

2tanx=1-tan^2x right?

Let tanx=y...

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