Hello sblocker

Welcome to Math Help Forum!I think you mean , not . Look at the diagram (click to enlarge):

Can you see that you'll use the angle of to find the ratios for ?

Write down the sine, cosine and tangent of and . (You should know what these are.)b) Use the unit circle to find exact values of the three primary trig. ratios for 210 and 240 degrees

Can you see from the diagram that to get the sine, cosine and tangent of and you'll simply change the sign of all these values from + to - ?

No time to answer this now. I'll do so later if no-one else answers in the meantime.2. A fishing boat is 15km south of a lighthouse. A yacht is 15km west of the same lighthouse.

a) Use trigonometry to find an exact expression for the distance between the two boats.

b) Check your answer using another method.

Any help would be appreciated

Grandad