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Do you know what Sin(2theta) is equal to. Recall your trig identites.
2sin theta cos theta
Good :) .
Now draw a triangle.
But be careful. It says Theta is between pi and 2pi/3 . Do you know what quadrant that refers to?
No it's 3rd :) .
i thought it was 4pi/3 in third...
No it's 2pi/3 :) .
shouldn't the 270 degrees be 3pi/2?
yeah. My mistake XD .
I was about to fix that.
lol everyone makes mistakes
I probably lured you to make the mistake when i first said it was in the 3rd quad
right. got that
Na, it was my fault for no remembering the unit circle lol.
kk. so You need to draw a triangle in quadrant 3.
It says Tan theta which is adjacent/hypotenuse.
Whoops. 2 sorry.
omg my mistake this tme it is 3
I am drunk toady...
that was my mistake though
anyway so opp/adj right
So Vertically the triangle is down by 20 and horizontally by 21.
and i did get the hypoteneuse. Its 29
and so i know sin too. Its 20/29
Now you can find sin(theta) and cos(theta) from that.
but i don't know how to get sin 2theta
No need. We changed the question.
We said Sin(2theta) is 2sin(theta)cos(theta) . Those are equivalent.
oh!!!!! WOW you are my life saver
Haha no problem :) .
that was awesome Thanks a lot.
No problem :) .
you saved my final exam tommorrow. Thanks again!
Anytime! Good luck!