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Class 12 Exam 2017 : English Paper 1 (English Language)

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www.mathportal.org Math Formulas: Trigonometry Identities Right-Triangle Definitions 1. sin = Opposite Hypotenuse 2. cos = Adjacent Hypotenuse 3. tan = Opposite Adjacent 4. csc = 1 Hypotenuse = sin Opposite 5. sec = 1 Hypotenuse = cos Adjacent 6. cot = 1 Adjacent = tan Opposite Reduction Formulas 7. sin( x) = sin(x) 8. cos( x) = cos(x) 9. 10. 11. 12. x 2 cos x 2 sin +x 2 cos +x 2 sin = cos(x) = sin(x) = cos(x) = sin(x) 13. sin( x) = sin(x) 14. cos( x) = cos(x) 15. sin( + x) = sin(x) 16. cos( + x) = cos(x) Basic Identities 17. sin2 x + cos2 x = 1 18. tan2 x + 1 = 1 cos2 x 19. cot2 x + 1 = 1 sin2 x Sum and Difference Formulas 1

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