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- 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)

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- anonymous

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- anonymous

first one is true because cosine is even

- anonymous

that is to say
\[\cos(x)=\cos(-x)\]

- anonymous

hello anwar

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- anonymous

Hi :)

- anonymous

second one is true because they add up to 90

- anonymous

third one is false because the reciprocal of sine is cosecant, not secant.

- anonymous

how am i doing so far?

- anonymous

seems right

- anonymous

and 4th is true

- anonymous

really? why?

- anonymous

CAST RULE!

- anonymous

2pi/3 and 4pi/3 , both have relative angles of pi/3 with the x axis

- anonymous

and cos is negative in both 2 and 3rd quadrants

- anonymous

what the monkey is cast rule?

- anonymous

thing its something similar to ASTC

- anonymous

Please tell me, what is the cast rule? lol!

- 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

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

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

yeh I wouldnt worry about this cast rule thing, its the first time I have ever heard of it, ever

- anonymous

it will only confuse you

- anonymous

http://www.physics.uoguelph.ca/tutorials/trig/trigonom2.html

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