A-Level Maths | Trigonometry (Year 13)

Radians

• 180 degrees = pi radians
• 360 degrees = 2 pi radians
• 90 degrees = 1/2 pi radians
• To convert degrees to radians: divide by 180 and times by pi
• To convert radians to degrees: divide by pi and times by 180

sec(x), cosec(x) and cot(x)

• sec(x) = 1/sin(x)
• cosec(x) = 1/ sin(x)
• cot(x) = 1/tan(x)

Question 1

Question 2

Question 3 (Hard)

Pythagorean Identities

• S = I + T
• sec²(x) = 1 + tan²(x)
• cosec²(x) = 1 + c0t²(x)

Question 4

Question 5

Question 6

Question 7

Double Angle Identities (IN PROGRESS)