Question

How to find sin, cos, and tan without calculator?

Answer 1

use the tables available for such calculations....

Answer 2

Let's say, you are given a fraction
\[\sin \theta = \frac 35\]

Now the ratio of sin is, opp/hyp.

So if we draw a triangle, it will look something like,

Answer 3

Try Clark's Table available in printed form...

Answer 4

Now..
find the 3rd side using a Pythagoras theorm.
\[5^2 - 3^2 = P ^2\]\[25 - 9^2 = P^2\]\[P = 4\]
So now we have something like,