Question

Select the functions that have a value of 1.

sin 90°
cos90°
tan90°
csc90°
sec90°
cot90°

Answer 1

`\displaystyle csc\:90°, sin\:90°`

Step-by-step explanation:

You need to know the Unit Circle in order to figure this out.

Extended Information on Trigonometric Identities

`\displaystyle (y)/(r) = sin\:θ`

`\displaystyle (x)/(r) = cos\:θ`

`\displaystyle (y)/(x) = tan\:θ`

`\displaystyle (r)/(x) = sec\:θ`

`\displaystyle (r)/(y) = csc\:θ`

`\displaystyle (x)/(y) = cot\:θ`

Where r is the length of the radius

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