Unexpected result when using trigonometric function on KitKat's calculator

I get unexpected results when using the trigonometric functions on my Android 4.4.2 phone. For example, if I enter sin(30)= I get the result -0.9880316 when I expect the result 0.5. It appears the phone expects trigonometric numbers to be expressed in radians rather than degrees which is uncommon - the phone's manual certainly did not mention it. Most calculators work in degrees. Decent calculators have a deg/rad/grad switch. Is there a way to do this on the phone or am I forced to include a degrees-to-radians conversion in all my trig calculations?