Cosine rule
This proofs shows that the cosine rule is correct.
This proofs shows that the cosine rule is correct.
This proof shows a formula for calculating the distance between a point and a line in the form of y = ax + b.
This table shows all exact values of sine, cosine and tangent.
This shows Heron's formula for finding the area of any triangle.
This proof shows that the limit as x goes to zero of sin(x) over x converges to one.
This proofs shows how the famous Pythagorean theorem works: a^2 + b^2 = c^2
This proof shows that the ratio between a triangle's side length and the sine of its angle is the same for all sides.
This proof shows that sine squared plus cosine squared is always one, using the Pythagorean theorem.
This proof shows that sine divided by cosine is tangent.
This proof shows the exact value of sin(15), cos(15) and tan(15)
This proof shows the exact value of sin(18), cos(18) and tan(18)
This proof shows the exact value of sin(3), cos(3) and tan(3).
This proof shows the exact value of sin(30), cos(30), tan(30), sin(60), cos(60) and tan(60).
This proof shows the exact value of sin(36), cos(36) and tan(36)
This proof shows the exact value of sin(45), cos(45) and tan(45)
This proof shows the exact value of sin(54), cos(54) and tan(54)