Maths - Chapter 3, Trigonometric Functions
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24 Terms
sin (x+y)
sin x cos y + cos x sin y
sin (x - y)
sin x cos y - cos x sin y
cos (x+y)
cos x cos y - sin x sin y
cos (x-y)
cos x cos y + sin x sin y
tan (x+y)
tanx + tany / 1 - tanx tany
tan (x-y)
tanx - tany / 1 + tanx tany
cot (x+y)
cot x cot y - 1 / cot y + cot x
cot (x-y)
cot x cot y + 1 / cot y - cot x
sin 2x
(2 tan x) / (1 + tan2 x)
2sin x cos x
cos 2x
(1 - tan2 x) / (1 + tan2 x)
cos2 x - sin2 x
2 cos2x - 1
1 - 2 sin2 x
tan 2x
(2tan x) / (1 -tan2 x)
cot 2x
(1 - cot2 x) / (2cot x)
sin 3x
3 sin x - 4 sin3 x
cos 3x
4 cos3 x - 3 cos x
tan 3x
(3 tan x - tan3 x) / ( 1 - 3 tan2 x)
cot 3x
( 1-3 cot2 x) / (3 cot x - cot3 x)
sin C + sin D
2sin (C+D/2) cos (C-D/2)
sin C - Sin D
2cos (C+D/2) sin (C-D/2)
cos C + cos D
2cos (C+D/2) cos (C-D/2)
cos C - cos D
2sin (C+D/2) sin (C-D/2)
2 sin A cos B
sin (A+B) + sin (A-B)
2 cos A sin B
sin (A+B) - sin (A-B)
2 cos A cos B
cos (A+B) + cos (A-B)
2 sin A sin B
cos (A-B) - cos (A+B)
