Trigonometry Flashcards
R = sin / cos (x-a)
1
Q
a sin x + b cos x = R sin (x+alfa)
If -, then -.
a cos x + b sin x = R cos (x-alfa)
If-, then+.
A
R = root (a square + b square)
R sin alfa = b
R cos alfa = a
Tan alfa = b/a.
2
Q
1 + tan square x
1 + cot square x
A
Sec square x
Cosec square x
3
Q
Cos 2x
A
1-2sin square x
2cos square x-1
Cos square x - sin square x
4
Q
Tan 2x
Tan (a+b) or minus
A
2 tan x / 1- tan square x
Tan a + tan b / 1 - tan a tan b
Change + to - and - to +.
5
Q
Sin (a+b) or minus
Cos (a+b) or minus
A
Sin a cos a + cos b sin b
Cos a cos b - sin a sin b
