Question

Need help with some inverse trigonometric expressions, rounded to the nearest degree.

Sin-1(0.33)
Cos-1(0.47)
Tan-1(1.21)
Sin-1(0.82)

Answer 1

A Google or Bing search box can be your friend, if you don't have a calculator with inverse trig functions. Most calculators that have trig functions also have the inverse functions, usually after a 2nd or "shift" key. Often, there is a mode setting for degrees or radians.

arcsin(0.33) ≈ 19°
arccos(0.47) ≈ 62°
arctan(1.21) ≈ 50°
arcsin(0.82) ≈ 55°