Question

How do you find sin, cos, tan?

Answer 1

See explanation

Explanation:

...best math teacher I had said: "memorize as little as possible in mathematics."

But this is something that you really must memorize. Commit it to heart. If you become an engineer or scientist it will be as second nature as knowing your right hand from your left.

Have a look at the diagram. We'll call angle BAC `theta`.

`a/c = sin theta`
`b/c = cos theta`
`a/b = tan theta`

Learn it - Love it - Live it

GOOD LUCK

Answer 2

The above definitions come from triangle trigonometry.
In pure Trigonometry, the main trig functions f(x) = sin x, g(x) = cos x, h(x) = tan x are defined by the trig unit circle.
When an arc x rotates counterclockwise on the unit circle, it creates
the 3 main trig functions.