MA100 Chapter 4: Trigonometry
Document Summary
Text references: stitz-zeager: 10. 1 - 10. 3, 10. 5, 10. 7. Ma100 lab notes: recall such popular acronyms such as soh cah t oa, which gives the required ratio of two sides of a right triangle for each principle trigonometric function. Adjacent x y: and the cast rule, which aids in remembering in which quadrants each ratio has a positive value (cid:21) C cosine is + ve, tangent and sine are ve in quadrant iv; A all three ratios are + ve in quadrant i; S sine is + ve, tangent and cosine are ve in quadrant ii; T tangent is + ve, cosine and sine are ve in quadrant iii: we may also need to consider the reciprocal ratios, which are termed the cosecant, the secant and the cotangent. 1 sin hypotenuse opposite sec = 1 cos hypotenuse adjacent cot = 1 tan adjacent opposite: remember that we work in radian measure rather than degrees.
