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Sin or Sine is the ratio of the Opposite side Over The Hypoteneuse of any right angled triangle

inverse sin or inverse sine ( they mean the same thing ) uses the same ratio to find an unknown angle and can be written as sin-1

so if you know two sides ( opposite and Hypoteneuse ) then you can work out the sin...then you can either use a calculator to determine the inverse ( or angle ) or you could look up the sin in a booklet of sin values and determine the angle

Example : in the triangle ABC the line ab=4 ac = 5 and the angle abc =90

we could find the sin of the angle acb

sinacb= opp/hyp = 4/5 = 0.8

to find sin-1 of 0.8

calcultor press 0.8

press inv button or on newer calculators the 2nd functon button

then press the button marked sin

the display should then display 53.1301....or 53 to 2 sig figures

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Q: How do you calculate sin inverse?
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