SOLUTION: The function {{{ y = 4 }}}cos(½ {{{ x }}}) has the period of A) π/2 B) π C) 2π D) 4π

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Question 1061596: The function +y+=+4+cos(½ +x+) has the period of
A) π/2
B) π
C) 2π
D) 4π

Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
+y+=+4%2Acos%28+%281%2F2%29%2Ax+%29+
The cosine function repeats every +2%2Api+ radians
Check +%281%2F2%29%2Ax+ over +0+ radians to +2%2Api+ radians
+%281%2F2%29%2Ax+=+0+
+x+=+0+
and
+%281%2F2%29%2Ax+=+2%2Api+
+x+=+4%2Api+
----------------------
Answer is (D)
This function of +x+ repeats
every +4%2Api+ radians