Trigonometric ratios for allied angles

Trigonometric ratios for angles of the form n.90 + or- an angle

[srilakshmi]

Wow.great sir, your explanation was very nice for understanding

[thammanasusila]

Thank you sir your explanation is very nice and it is cleared my confusion

[valletisaipraneeth]

sir random pe aya marks lekar aya thanks sir

[md.saifmoazzam]

Sir, odd multiple of π/2 pe trigonometric ratio change kyon ho jaata h..?