Introduction to BASIC
Trigonometric Functions
OPTION ANGLE DEGREES
When OPTION ANGLE DEGREES is written, the unit of angles is set to be degrees.
Example.
10 OPTION ANGLE DEGREES 20 PRINT SIN(30),COS(30),TAN(30) 30 END
On this case, SIN(30),COS(30),TAN(30) stand for sin30°, cos30°, tan30°, respectively.
Inverse Cosine
The range of ACOS(x) is from 0° to 180°.
Example. A program that finds the angle A from the length a, b, c of three sides of a triangle by applying the cosine law.
10 OPTION ANGLE DEGREES 20 INPUT a,b,c 30 PRINT ACOS((b^2+c^2-a^2)/(2*b*c)) 40 END
Refer to Trigonometric Functions