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Math.cos

 
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how to find 42 degree ??
a. Math.cos(42);
b. Math.cos(Math.toDegree(42));
c. Math.cos(Math.toRedian(42));
 
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Math.cos(x) expects x to be in radians which means you have to convert 42 degrees to radians, this is done by Math.toRadians(42). With other words, alternative c is correct:
c. Math.cos(Math.toRadians(42));
 
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Weerawit,
Please note the methods are toDegrees and toRadians.
 
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