6 Trigonometric Functions

For angle θ in right triangle: sin=P/H, cos=B/H, tan=P/B=sin/cos. Reciprocals: cosec=1/sin=H/P, sec=1/cos=H/B, cot=1/tan=B/P. For angles beyond 90°: use CAST rule. Quadrant I: all +ve. Quadrant II: only sin,cosec +ve. Quadrant III: only tan,cot +ve. Quadrant IV: only cos,sec +ve.