anonymous
  • anonymous
Are the following true or false & why? cos(-175°) = cos(175°) cos(32°) = sin(58°) sin(π/3) = 1/sec(π/3) cos(2π/3) = cos(4π/3)
Mathematics
jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
first one is true because cosine is even
anonymous
  • anonymous
that is to say \[\cos(x)=\cos(-x)\]
anonymous
  • anonymous
hello anwar

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anonymous
  • anonymous
Hi :)
anonymous
  • anonymous
second one is true because they add up to 90
anonymous
  • anonymous
third one is false because the reciprocal of sine is cosecant, not secant.
anonymous
  • anonymous
how am i doing so far?
anonymous
  • anonymous
seems right
anonymous
  • anonymous
and 4th is true
anonymous
  • anonymous
really? why?
anonymous
  • anonymous
CAST RULE!
anonymous
  • anonymous
2pi/3 and 4pi/3 , both have relative angles of pi/3 with the x axis
anonymous
  • anonymous
and cos is negative in both 2 and 3rd quadrants
anonymous
  • anonymous
what the monkey is cast rule?
anonymous
  • anonymous
thing its something similar to ASTC
anonymous
  • anonymous
Please tell me, what is the cast rule? lol!
anonymous
  • anonymous
i mean i see that they are the same from drawing a circle. so the answer is true. so i am not casting any doubts
anonymous
  • anonymous
it tells you when the trig functions are positive going counterclockwise from the fourth quadrent labelling it C, then A, then S, T. C= cosine, A all, S = sine, T tan
anonymous
  • anonymous
Sorry for all of the trouble I'm causing! I just really don't understand any of this :( But you guys are really helping out!!!
anonymous
  • anonymous
yeh I wouldnt worry about this cast rule thing, its the first time I have ever heard of it, ever
anonymous
  • anonymous
it will only confuse you
anonymous
  • anonymous
http://www.physics.uoguelph.ca/tutorials/trig/trigonom2.html

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