Topic 9 0.0 / 5 ? MathematicsTrigonometric ratiosASEdexcel Created by: Jemma1494Created on: 04-06-21 14:45 Cosine rule for unknown side a^2 = b^2 + c^2 - 2bc cosA 1 of 9 Cosine rule for unknown angle cosA = (b^2 + c^2 - a^2)/2bc 2 of 9 Sine rule for angles a/sinA = b/sinB = c/sinC 3 of 9 Sine rule for sides sinA/a = sinB/b = sinC/c 4 of 9 Area of a triangle Area = 1/2 ab sinC 5 of 9 Notation for a and A a = side A = angle opposite to side a 6 of 9 Sin graph rules y = sin θ repeats every 360° Crosses x axis at -180°, 0°, 180°... Min y value of -1 Max y value of 1 Starts at (0,0) 7 of 9 Cosine graph rules y = cos θ repeats every 360° Crosses x axis at -90°, 90°, 270°... Min y value of -1 Max y value of 1 Starts at (0,1) 8 of 9 Tan graph rules y = tan θ repeats every 180° Crosses x axis at -180°, 0°, 180°... No min or max value Vertical asymptotes at x=-90° and x=90° 9 of 9
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