Math Goniometrie Formulas 5LAWI8

sin² a + cos² a = 1

sin a / cos a = 1 / cot a

cos a / sin a = 1 / tan a

1 / cos a

1 / sin a

1 / cos² a = sec² a

1 / sin² a = csc² a

sin a . cos b + cos a . sin b

sin a . cos b - cos a . sin b

cos a . cos b - sin a . sin b

cos a . cos b + sin a . sin b

(tan a + tan b) / (1 - tan a . tan b)

(tan a - tan b) / (1 + tan a . tan b)

2 . sin a . cos a

cos² a - sin² a = 2cos² a - 1 = 1 - 2sin² a

2tan a / (1 - tan² a)

(1 - cos 2a) / 2

(1 + cos 2a) / 2

(2tan a/2) / (1 + tan² a/2) = 2t / (1 + t²)

(1 - tan² a/2) / (1 + tan² a/2) = (1 - t²) / (1 + t²)

(2tan a/2) / (1 - tan² a/2) = 2t / (1 - t²)

3sin a - 4sin³ a

4cos³ a - 3cos a