Find exactly: sin^2 (-30˚) + cos^2 (-30˚)
2007-01-09 15:58:27 · 5 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
sin^2 (x) + cos^2 (x) = 1 (fundamental relation)
if x = (-30˚)
so sin^2 (-30˚) + cos^2 (-30˚) = 1
2007-01-09 16:09:51 · answer #1 · answered by Tia do Batima 2 · 1⤊ 0⤋
One of the trigonometric identities is such that sin^2 (x) + cos^2(x) = 1.
Regardless of the degrees or radians used for x it will always equal one.
2007-01-10 00:23:15 · answer #2 · answered by achillesfear 3 · 1⤊ 0⤋
2!
2007-01-10 00:01:15 · answer #3 · answered by 8 - ßăļļ 4 · 0⤊ 2⤋
sin(-30)^2 + cos(-30)^2
this can also be written as
sin(x)^2 + cos(x)^2
which equals 1
sin(-30)^2 + cos(-30)^2 = 1
2007-01-10 01:12:49 · answer #4 · answered by Sherman81 6 · 1⤊ 0⤋
(-0.5)^2 + (0.866)^2 = 1
2007-01-10 00:05:01 · answer #5 · answered by Babygirl 3 · 0⤊ 0⤋