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anonymous

  • 5 years ago

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)

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  1. anonymous
    • 5 years ago
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    first one is true because cosine is even

  2. anonymous
    • 5 years ago
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    that is to say \[\cos(x)=\cos(-x)\]

  3. anonymous
    • 5 years ago
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    hello anwar

  4. anonymous
    • 5 years ago
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    Hi :)

  5. anonymous
    • 5 years ago
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    second one is true because they add up to 90

  6. anonymous
    • 5 years ago
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    third one is false because the reciprocal of sine is cosecant, not secant.

  7. anonymous
    • 5 years ago
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    how am i doing so far?

  8. anonymous
    • 5 years ago
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    seems right

  9. anonymous
    • 5 years ago
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    and 4th is true

  10. anonymous
    • 5 years ago
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    really? why?

  11. anonymous
    • 5 years ago
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    CAST RULE!

  12. anonymous
    • 5 years ago
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    2pi/3 and 4pi/3 , both have relative angles of pi/3 with the x axis

  13. anonymous
    • 5 years ago
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    and cos is negative in both 2 and 3rd quadrants

  14. anonymous
    • 5 years ago
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    what the monkey is cast rule?

  15. anonymous
    • 5 years ago
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    thing its something similar to ASTC

  16. anonymous
    • 5 years ago
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    Please tell me, what is the cast rule? lol!

  17. anonymous
    • 5 years ago
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    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

  18. anonymous
    • 5 years ago
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    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

  19. anonymous
    • 5 years ago
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    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!!!

  20. anonymous
    • 5 years ago
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    yeh I wouldnt worry about this cast rule thing, its the first time I have ever heard of it, ever

  21. anonymous
    • 5 years ago
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    it will only confuse you

  22. anonymous
    • 5 years ago
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    http://www.physics.uoguelph.ca/tutorials/trig/trigonom2.html

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