ShmoopTube
Where Monty Python meets your 10th grade teacher.
Search Thousands of Shmoop Videos
SOHCAHTOA (values and properties of trig functions) Videos 8 videos
ACT Math: Trigonometry Drill 1, Problem 1. What is the length of y?
ACT Math Trigonometry Drill 1, Problem 2. Can you find the tangent?
ACT Math: Trigonometry Drill 1, Problem 4. Can you find the sine?
ACT Math 1.2 Trigonometry 274 Views
Share It!
Description:
ACT Math Trigonometry Drill 1, Problem 2. Can you find the tangent?
- Trigonometry / SOHCAHTOA (values and properties of trig functions)
- Trigonometry / Trig identities
- Product Type / ACT Math
- Foreign Language / Arabic Subtitled
- Foreign Language / Spanish Subtitled
- Foreign Language / Korean Subtitled
- Foreign Language / Chinese Subtitled
- Trigonometry / Solving trigonometric equations
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
Full Transcript
- 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.
Related Videos
ACT Math: Coordinate Geometry Drill 1, Problem 1. Which inequality is expressed by the number line?
ACT Math: Intermediate Algebra: Drill 3, Problem 1. Find the fifth number in the series.
ACT Math: Plane Geometry Drill 3, Problem 1. What is the area of the trapezoid shape in the video?
Haven't you always wondered how much cardboard it takes to encase a trunk warmer for your pet elephant?
Want to figure out the area and perimeter of irregular shapes? Break them down into regular shapes. For example, a flower can be broken down into s...