cosh(): Hyperbolic cosine

float cosh(float X);
X is the input value

echo cosh(0); // Output is 1
echo "<br>";
echo cosh(1); // Output  1.5430806348152
echo "<br>";
echo cosh(-1); // Output 1.5430806348152
echo "<br>";
echo cosh(4.2); // Output is 33.350663308873
echo "<br>";
echo cosh(2); // Output is 3.7621956910836
echo "<br>";
echo cosh(90); // Output is 6.1020164715892E+38
Math Functions COS() function SIN() function
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