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Trig identities Videos 7 videos
ACT Math Trigonometry Drill 1, Problem 2. Can you find the tangent?
ACT Math: Trigonometry Drill 1, Problem 3. Can you find the cosine?
ACT Math: Trigonometry Drill 1, Problem 4. Can you find the sine?
ACT Math 3.4 Trigonometry 218 Views
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Description:
ACT Math: Trigonometry Drill 3, Problem 4. Which of the following answer choices is true?
- Trigonometry / Trig identities
- Product Type / ACT Math
- Foreign Language / Arabic Subtitled
- Foreign Language / Korean Subtitled
- Foreign Language / Spanish Subtitled
- Foreign Language / Chinese Subtitled
- Trigonometry / Values and properties of trigonometric functions
- Trigonometry / Use of trigonometric identities
Transcript
- 00:02
Here's your shmoop du jour, brought to you by Shortcuts. Pay no attention to the glowing
- 00:08
eyes. This way is definitely quicker. Which of the following answer choices is true?
- 00:18
Well sorry if you were looking for a shortcut to the answer to this problem...there really isn't one...
- 00:23
We just have to know our trig identities,
- 00:25
So let's start with A. Sin alpha equals 1
Full Transcript
- 00:30
over cosecant alpha. Remember that cosecant is the reciprocal of
- 00:36
sine. So sin alpha equals 1 over cosecant alpha. This one's true.
- 00:43
Answer choice B...secant equals 1 over cosine yup. Secant is the reciprocal of cosine. Check!
- 00:50
Ok, last one. Tangent alpha equals sin alpha over cosine alpha. Again, we just have to
- 00:57
know it but yeah, this one works, too.
- 01:00
Because A, B, and C are all correct. Answer choice E is the one we want.
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