Posted by anonymous on Friday, April 10, 2009 at 5:40pm.
if 0< theta < 90 and tan theta equals pie3/2, find cos theta.i put 2/pie 7 but i was wrong please correct.

math  Reiny, Friday, April 10, 2009 at 6:00pm
I don't know what you mean by
pie3/2 and by 2/pie 7
do you mean 3pi/2 ? or ???
2/pie 7 is even more confusing.
remember tan(theta) = opposite/ adjacent
so you can form a rightangled triangle in the first quadrant, fill in those two sides, then use Pythagoras to find the hypotenuse.
And cos(theta) = adjacent/hypotenuse

math  anonymous, Friday, April 10, 2009 at 6:04pm
my nswers was 2/pi7 but i ws wrong

math  Reiny, Friday, April 10, 2009 at 6:12pm
you did not answer my question.
What do you mean by 2/pi7 ???
do you mean 2/(7pi) ? or (2/pi)(7) ? or ...
write it as (numerator)/(denominator)

math  anonymous, Friday, April 10, 2009 at 7:09pm
sorry my nswer was 2/(7 pi) but it ws wrong
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