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ACT Math 1.2 Trigonometry 273 Views


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Description:

ACT Math Trigonometry Drill 1, Problem 2. Can you find the tangent?

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Transcript

00:02

And here is your shmoop de jour.

00:04

What is the tangent of a forty-five degrees?

00:07

And here are the potential answers...

00:11

Since we want to know what the tangent of forty-five degrees

00:14

is, we can use the half angle formula with ninety degrees because

00:19

ninety divided by two is 45. So

00:22

we just plug in ninety for X and a half angle formula here

00:25

Tangent ninety over two equals one minus cosine

00:29

ninety over sine of ninety. Cosine of 90 is 0 and Sine of 90 is 1

00:35

our equation now looks a lot more welcoming and tangent of ninety divided by 2

00:39

equals one number one

00:40

so we've simplified and tangent of forty-five equals 1.

00:44

So there you go, it's answer C.

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