Title: Formules Trigo / Trig Identities LHG
Tags: Maths, mathematics, mathematiques, mathématiques, trigonometrie, trigonometry trigonoméetrie,

Q: Arxcos(-x)       in terms of Arccos x
A: Arxcos(-x) = Pi - Arccos x    (sym p.r. y=Pi/2)

Q: Arcsin(-x)       in terms of Arcsin x
A: Arcsin(-x)=-Arcsin x   (odd/impaire)

Q: 1+tan^2(x)
A: 1+tan^2(x) = sec^2(x)

Q: 1+cot^2(x)
A: 1+cot^2(x) = cosec^2(x)

cos(a+b)

sin(a+b)

cos(a-b)

sin(a-b)

tan(a+b)

tan(a-b)

cos(2a) = ... = ... = ...

sin(2a)

tan(2a)

cos p + cos q,  as a product

cos p - cos q,  as a product

sin p - sin q,  as a product

sin p + sin q,  as a product

cos x in terms of t=tan(x/2)

sin x in terms of t=tan(x/2)

tan x in terms of t=tan(x/2)

cos(3x)

sin(3x)

Lineariser (cos x)^2

Lineariser (sin x)^2

Arcsin x       in terms of Arccos x