Answer:
(a) 45°
(b) 60°
Step-by-step explanation:
1. Read your scientific or graphing calculator's manual.
2. Put the calculator into "degrees" mode.
3. (a) Use the inverse sine function:
sin⁻¹(.707107) = 45.000°
(b) Use the inverse cosine function:
cos⁻¹(0.5) = 60.000°
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Often, these functions are available as "2nd" functions on the same keys as the sin or cos functions.
