Math B Exam Trig Question - June 2008?

Question

About that trig question.. with the answers something like 90, 221, 318...

i was able to get 90 by using the cos reference angle of 0, and the other 2 i used from the calculator and had some work. But i messed that question up badly lol. any idea if i would get any credit for the answers ? or just having the correct work for getting the 90 degree answer? Thanks

Answer 1

it was 221.4 because you had to round to the nearest tenth.

plus, it was sin, not cos.

but i got those answers as well, but i rounded correctly.

(that test was hard compared to the past regents i took the night before!)

Answer 2

yea i got 90, 221.8 or something, then 312. something. i remember u had to round to the nearest hundredth...

But you'll get some credit for at least getting the 90 and showing work

Answer 3

i also got only 90

i think we get partial credit.

Answer 4

i believe it was 3cos(2x)+2sin(x)+1

i got the correct answer on the calc but i couldnt get it showing work

answers were 90.00,221.81,318.19

if you had the correct answers you get 2 points, i think youll get 1 point:-) for having 90

2 points for showing work:-)

Now answering the ? i know you had to substitute cos(2x) with 1-sin^2(x) but i did and was unable to get correct answers. I think i got 1 point because i did it on calc but i didnt round right:-( i didnt have 90.00