Question

How do you find the value of `tan90`?

Answer 1

`tan(90^@)` is undefined

Explanation:

By definition, using a reference triangle with hypotenuse of unit length,
`color(white)("XXX")tan(theta) = ("length of opposite side")/("length of adjacent side")`

As `theta rarr 90^@`
`color(white)("XXX")"length of opposite side" rarr 1`
and
`color(white)("XXX")"length of adjacent side" rarr 0`

`1/0` is undefined `rArr tan(90^@)` is undefined.