cos()

Return the cosine of the argument.

Syntax
Parameters
Description
Example

Syntax

cos(radians)

Parameters

Parameter	Definition
radians	arc length in radians whose cosine is to be determinedValid Values –∞ ≤ radians ≤ ∞

Description

The cos() function returns the cosine of radians. The output range for the cos() function is -1 ≤ cos() ≤ 1.

Example

The following example uses the cos() function to draw a crude graph of a cosine waveform over a half period:

print("Cosine Waveform:\n\n");
print(" -1 -0.5 0 0.5 1\n");
print(" +----+----+----+----+\n");
i = 0.0; while (i <= 3.2) {
printf("%4.2f ",i);
cosine = cos(i);
plot = int(10 * cosine) + 10;
if (plot < 10) {
before = "";
j = 1;
while (j <= plot) {
before = before . " ";
j++;
}
after = "";
j = plot; while (j < 9) {
after = after . " ";
j++;
}
print(before,"*",after,"|");
printf(" cosine = %+8.6f\n",cosine);
}
elsif (plot == 10) {
print(" *");
printf(" cosine = %+8.6f\n",cosine);
}
else {
print(" |");
before = "";
j = 11;
while (j < plot) {
before = before . " ";
j++;
}
print(before,"*");
after = "";
j = plot + 1;
while (j <= 22) {
after = after . " ";
j++;
}
print(after);
printf("cosine = %+8.6f\n",cosine);
}
i = i + 0.1;
}

The example produces the following output: