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Maths Triganometry help?

Kelly090 · 2016-02-22 21:08:17

sin x = 0.5 Give the answer in radians? How do you do this anyone? Thanks!

22-02-2016 10:08PM

#1

Kelly090

Registered Users, Registered Users 2 Posts: 80 ✭✭

Join Date: March 2014

Posts: 61

sin x = 0.5
Give the answer in radians?
How do you do this anyone? Thanks!

0

Comments

#2 22-02-2016 10:12PM

skippy1977

Registered Users, Registered Users 2 Posts: 284 ✭✭

Join Date: May 2008

Posts: 279

So if you look at the table on page 13 of the tables book it will tell you that the sin inverse of 0.5 is 30 degrees or pi/6 radians (below 30 in the table). You can find this on the calculator either.

To turn degrees into radians multiply by pi/180

30 x pi/180 = 30pi/180
=pi/6

Now if the question asks for all solutions between 0 and 360 degrees then there is a bit more work using the CAST method. Sin 150 also gives 0.5 so 150 or 5pi/6 would be another solution.

0