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11. Trigonometrical values in degree measurement:, 45°, 0°, 30°, 60°, 90°, 1, V3, 2, 1, sin 0, 1, V3, 2, 1, 1, cos e, 1, 2, 1, tan 0, 1, V3, V3, 12. Reduction Formulas or CAST or ASTC formulas:, sin(90° + 0) = + cos 0, cos(90° + 0) = - sin e, tan(90° + 0) = - cot 0, cot(90° + 0) = - tan 0, sec(90° + 0) = - cosec e, sin(90° – 0) = + cos 0, cos(90° – 8) = + sin 8, tan(90° – 0) = + cot 0, cot(90° – 0) = + tan 0, sec(90° -0) = + cosec 0, cosec(90° – 0) =+ sec 0, %3D, %3D, cosec(90° + 0) = + sec 0, sin(180° + 0) = - sin 8, sin(180° – 0) = + sin 0, cos(180°-0) = - cos 0, tan(180° – 0) = - tan 0, cot(180° -0) = - cot e, sec(180° - 0) =- sec e, cos(180° + 0) = - cos e, tan(180° + 0) = + tan 0, cot(180° + 0) = + cot 0, sec(180° + 0) = - sec e, cosec(180° + 0) = - cosec e, %3D, %3D, %3!, %3D, cosec(180° – 0) = + cosec e, sin(270° – 0) = - cos e, cos(270° – 0) = - sin e, tan(270° - 0) =+ cot 0, cot(270° - 0) = + tan 0, sec(270° – 0) = – cosec e, cosec(270 - 0) =- sec 0, sin(270° + 0) = - cos 0, cos(270° + 0) = + sin 0, tan(270° + 0) =-cot 8, cot (270° + 0) = - tan 8, sec(270° + 0) = + cosec e, cosec(270° + 0) = - sec e, %3D, sin(360° + 0) = +sin 0, cos(360° + 0) = + cos e, tan(360° + 0) = + tan 0, cot(360° + 0) = + cot 0, sec(360° + 0) = + sec e, cosec(360° + 0) = + cosec 0, sin(360° – 0) = - sin e, cos(360° – 0) = + cos e, tan(360° – 0) = – tan 8, cot(360° – 0) = - cot 0, sec(360° - 0) = + sec 0, cosec(360° - 0) = - cosec, ratio(90° x odd + 0) = Change, sin(-0) = - sin 0, cos(-0) = + cos 0, tan(-8) = - tan e, cot(-0) = - cot e, sec(-0) = + sec 0, cosec(-8) = - cosec e, %3!, ratio(90° x even + 0) = No change, (90° + 0), (180° - 0), 2nd quadrant SA 1" quadrant, (90° – 0), (360° + 0), 3rd quadrant T C 4th quadrant, (360° – 0), (270° + 0), (180° + 0), (270° – 0)