Frannie E.

# Are 2tantheta and tan2theta the same thing? If not then how do i plug both into my calculator?

I have a math problem in which I have to prove the identity sin2θ= 2tanθ/1+tan2θ using Double-Angle Identities and I'm trying to figure out how to solve it.

## 2 Answers By Expert Tutors

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Tutor
5 (5)

Understanding all Sines of Triangles

Michael J.

You hit the wrong key when typing in the identity.
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12/15/16

Hilton T.

tutor
Michael,
Please check the identity. In the identity for tan (2theta), there should be a negative sign (not a positive sign) in the denominator.
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12/15/16

Michael J.

The student made an error in the question title.  I went with the detailed description:

Prove               sin2θ = 2tanθ/(1+tan2θ)
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12/16/16

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