Some Important Formulae of Trigonometric –
1.)
1
(i) cosec A = ---------,
sin A
1
(ii) sec A = ----------,
cos A
1
(iii) cot A = ---------
tan A
2.)
sin A
(i) ---------- = tan A,
cos A
cos A
(ii) ---------- = cot A,
sin A
(iii) tan A . cot A = 1
3.)
(i) sin² A + cos² A = 1,
=> sin² A = (1 – cos² A),
and
cos² A = (1 - sin² A)
(ii) 1 + tan² A = sec² A,
=> sec² A - tan² A = 1,
and
tan² A = sec² A - 1
(iii) 1 + cot² A = cosec² A
=> cot² A = cosec² A – 1,
and
cosec² A - cot² A = 1
Your second block of text...