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Home > PC3 > Chapter 7 > Lesson 7.1.3 > Problem 7-42


Use the diagram at right to calculate the exact values of the following trigonometric expressions.  


    Use the values given in the diagram.


    Calculate the length of the base of the triangle. What should the sign be?


    Use the information in the triangle and your calculated base from part (b).

Right triangle in second quadrant, vertical leg labeled 5, hypotenuse labeled 8, counter clockwise curved arrow, on central angle from positive x axis to hypotenuse, labeled alpha.