Question

What trigonometric ratios of angles from $0^o$ to ${90}^o$ are equal?

Answer 1

The trigonometric table of all the functions with all values are shown in the above table:

Hence, from the above table we observe that between $0^o$ to ${90}^o$, the below trigonometric functions are equal.

$\sin \frac{\pi }{2}=\csc \frac{\pi }{2}=1$

$\cos 0^o=\sec 0^o=1$

$\sin \frac{\pi }{4}=\cos \frac{\pi }{4}=\frac{\sqrt{2}}{2}$

$\sec \frac{\pi }{4}=\csc \frac{\pi }{4}=\sqrt{2}$

$\tan \frac{\pi }{4}=\cot \frac{\pi }{4}=1$