what is the exact value of cos(-90 degrees)?

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what is the exact value of cos(-90 degrees)?

2006-09-26 11:38:04 · 2 answers · asked by art_trashwendy 1 in Education & Reference ➔ Homework Help

2 answers

zero

2006-09-26 11:39:44 · answer #1 · answered by Anonymous · 0⤊ 0⤋

Attention: the function y = cos(x) is defined only the variable x is measured in Radians. Thus your question must change to
What is the value of cos(-pi/2).

The answer is cos(-pi/2) = cos(pi/2) = 0

2006-09-26 18:42:33 · answer #2 · answered by vahucel 6 · 0⤊ 0⤋