Trigonometry

• Area of a triangle: 1/2absinC
• Rules for sides(sin): a/sinA =b/sinB =c/sinC
• Cosine rules for sides: a^2 =b^2+c^2-2bccosA
• Sin rules for angles: SinA/a=sinB/b=sinC/c
• Cosine rules for angles: cosA= b^2+c^2-a^2/2bc