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OpenStudy (anonymous):
If tanx= -5/12 and x is in the 2nd quadrant, find sin2x. A) 10/13 B) 120/169 C) 0 D) -120/169
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OpenStudy (anonymous):
sin 2x=2sinx cos x in the second quadrant sine is positive and cosine is negative so sin2x is negative.
OpenStudy (anonymous):
|dw:1415951923878:dw|
OpenStudy (anonymous):
from the figure sin x=5/13 and cos x=-12/13
OpenStudy (anonymous):
this sin 2x=2*(5/13)*(-12/13)=-120/169
OpenStudy (anonymous):
option D is correct
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OpenStudy (anonymous):
@aminaj_xoxo
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