# Story of Zero by Dilip M. Salwi

By Dilip M. Salwi

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Sample text

III, 42. I, r y x r 39. I, x y 40. I, y x 43. I, r x 44. I, r y In Exercises 45–56, an equation of the terminal side of an angle u in standard position is given with a restriction on x. Sketch the least positive such angle u , and find the values of the six trigonometric functions of u . See Example 3. 45. 2x + y = 0, x Ú 0 46. 3x + 5y = 0, x Ú 0 47. -6x - y = 0, x … 0 48. -5x - 3y = 0, x … 0 49. -4x + 7y = 0, x … 0 50. 6x - 5y = 0, x Ú 0 51. x + y = 0, x Ú 0 52. x - y = 0, x Ú 0 53. - 23x + y = 0, x … 0 54.

64. 60 x y                 50             160 m 80 5 75    100 66.    c 40                                                         65. 120  100 10 90 Solve each problem. 67. Solar Eclipse on Earth The sun has a diameter Sun of about 865,000 mi with a maximum distance Earth from Earth’s surface of about 94,500,000 mi. Moon The moon has a smaller diameter of 2159 mi. For a total solar eclipse to occur, the moon must pass between Earth and the sun.

5034° 11.