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WHAT THE FUNCTIONS ARE

 






1.           38.0 sin a = ----------- = 0.4903              77.5	2.          1.5 sin b = -------- = 0.2308              6.5	3.           4.1 sin c = -------- = 0.7193              5.7
67.5 cos a =---------- = 0.8710              77.5	6.3 cos b = ------- = 0.9692               6.5	4.0 cos c = ------- = 0.7018               5.7
38.0 tan a =--------- = 0.5630             67.5	1.5 tan b = ------- = 0.2381              6.3	4.1 tan c = ------- = 1.025              4.0

If your answers are different from mine in the last digit, it is because I rounded the answers to the nearest 4th decimal place.

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Exercises:   [Round angles to whole angles.  Round ratios to four digits.]
 
1. cos  = 0.3333.  What is ? 71 degrees.
2. tan  = 0.75.  What is ? 37 degrees.
3. Angle r = 35 degrees.
1. What is the sin r?  0.5736
2. cos r = 0.8192
3. tan r = 0.7002
4. Angle i = 2.1 degrees.
1. sin i = 0.0366
2. cos i = 0.9993
3. tan i = 0.0367
5. sin i = 0.6667.  i= 42 degrees.
6. tan  = 1.50.  = 56 degrees.
7. sin i = 1/1.66.  i = 37 degrees.

(divide 1 by 1.66.  Punch [2nd, inv, shift] sin.  [If necessary, punch =.])
8. sin r = 1.498/1.523.  r = 80 degrees.

(divide 1.498 by 1.523.  Punch [2nd, inv, shift] sin.  [If necessary, punch =.])