Maths - Pure - Trigonometry

What I need to memorise for trig

How often does the sine graph repeat?

Every 2pi or every 360 degrees

How often does the cosine graph repeat?

Every 2pi or every 360 degrees

How often does the tangent graph repeat?

Every 1pi or every 180 degrees

What is sin²x + cos²x ?

1

what is tan x in terms of sine and cosine?

tan x = sin x / cos x 

What is sec x?

1 / cos x

what is cosec x?

1 / sin x

What is cot x?

1 / tan x = cos x / sin x

how many radians in 180 degrees?

pi radians

Arc length of sector radius r, angle theta (radians)?

r * theta

Area of sector radius r, angle theta (radians)?

½ r² * theta 

what is the double angle formula for sine?

sin(2x) = 2sin(x)cos(x)

What is the double angle formula for cosine?

cos(2x) = cos²(x) - sin²(x)

In what other forms can you write the double angle formula for cos(2x)?

2cos²(x) - 1

1 - 2sin²(x)

What is the double angle formula for tangent?

tan(2x) = 2tan(x) / (1-tan²(x))