anonymous
  • anonymous
find the sin(x+pi) in terms of x (HELP ME!!!!)
Trigonometry
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
- sinx
anonymous
  • anonymous
what does that mean ?
anonymous
  • anonymous
can you walk me through it

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anonymous
  • anonymous
that means angle lies in 3rd quadrant.
anonymous
  • anonymous
i still dnt get it how do i plug it in
anonymous
  • anonymous
is it sin(x=180) = -sinx
anonymous
  • anonymous
or am i way off
anonymous
  • anonymous
in 3rd quadrant sin ,cos,sec,cosec -ve but tan, cot +ve.
anonymous
  • anonymous
IM FREAKING LOST
anonymous
  • anonymous
using the trig identity sin(a+b) = sin(a)cos(b) + cos(a)sin(b) sin(x+pi) = sin(x)cos(pi)+ cos(x)sin(pi) cos(pi) = -1 sin(pi) = 0 and you get sin(x)(-1) + cos(x)(0) = -sin(x)
anonymous
  • anonymous
sin(180+x)= -sinx since sin is symmetrically opposite.

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