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Theta (θ) homework help?
1. If cos(-θ) = .345 find cos(θ) The answer is .345. How?
2. If sin (θ) = -0.345 find sin (-θ) The answer is .345. Also how?
Thanks in advance.
1 Answer
- callmemrwafflesLv 48 years agoFavorite Answer
1.
cos(x) is an even function. it is symmetric across x = 0. this means that cos(x) = cos(-x).
2.
sin(x) is an odd function. it has 180 degree rotational symmetry around the origin. this means that sin(-x) = -sin(x). think of the graph of y = x, another odd function. notice that if x = 3, y = 3, and if x = -3, y = -3.
