Math Tests formulas and practice

(cos a+b)

(cos a+b)

cos(a)cos(b)-sin(a)sin(b)

(cos a-b)

cos(a)cos(b)+sin(a)sin(b)

sin(a+b)

sin(a)cos(b)+sin(b)cos(a)

sin(a-b)

sin(a)cos(b)-sin(b)cos(a)

tan(a+b)

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

tan(a+b)

sin(a)cos(b)+cos(a)sin(b)/cos(a)cos(b)-sin(a)sin(b)

cos(2x)

cos²(x)-sin²

cos(2x)

2cos²(x)-1

cos(2x)

1-2sin²(x)

sin(2x)

2sin(x)cos(x)

cos(x/2)

± sqrt 1+cos/2

sin(x/2)

± sqrt cos-1/2

tan(x/2)

sin/1+cos

tan(2x)

2tan(x)/1-tan²

csc pi/6

2

csc pi/4

sqrt 2

csc pi/3

2 sqrt3 /3

sec pi/6

2 sqrt3 /3

sec pi/4

sqrt2

sec pi/3

2

cot pi/6

sqrt 3

cot pi/4

1

cot pi/3

sqrt 3 /3