Trig formula

Question 1

Cosine rule

Answer 1

c^2 = a^2 + b^2 - 2ab cos(C)

Question 2

Sine rule

Answer 2

a/ sin(A) = b/sin(B) = c/sin(C)

Question 3

area of a triangle in trig

Answer 3

Area = 1/2 bc sin(A)

Question 4

Pythagorean identity

Answer 4

sin^2 (A) + cos^2 (A) = 1

Question 5

SOHCAHTOA is…

Answer 5

sinθ = O/H
cosθ = A/H
tanθ = O/A
tanθ = sinθ/cosθ = m = gradient