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first one is true because cosine is even
that is to say \[\cos(x)=\cos(-x)\]
second one is true because they add up to 90
third one is false because the reciprocal of sine is cosecant, not secant.
how am i doing so far?
and 4th is true
2pi/3 and 4pi/3 , both have relative angles of pi/3 with the x axis
and cos is negative in both 2 and 3rd quadrants
what the monkey is cast rule?
thing its something similar to ASTC
Please tell me, what is the cast rule? lol!
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
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
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!!!
yeh I wouldnt worry about this cast rule thing, its the first time I have ever heard of it, ever
it will only confuse you