what is the exact value of cos(450) using the double-angle identity?

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2007-11-23 13:09:03 · 3 answers · asked by Dana R 1 in Education & Reference ➔ Homework Help

(square root of 2) divided by 2.

2007-11-23 13:15:58 · answer #1 · answered by Tim C 7 · 0⤊ 2⤋

450 = 360 +90
cos(450) = cos(90) =0

2007-11-23 21:23:28 · answer #2 · answered by Any day 6 · 0⤊ 0⤋

wouldn't it be same as cos 90

2007-11-23 21:14:19 · answer #3 · answered by Tardisman 2 · 0⤊ 1⤋