Question 1

How do I calculate sin, cos and tan?

Accepted Answer

Enter the angle and choose degrees or radians. The calculator instantly returns sin, cos, tan and their reciprocals (cosec, sec, cot). For example sin(30°) = 0.5, cos(60°) = 0.5, tan(45°) = 1.

Question 2

What is the difference between degrees and radians?

Accepted Answer

A full circle is 360 degrees or 2π radians (≈ 6.283). To convert degrees to radians multiply by π/180; to convert radians to degrees multiply by 180/π. This calculator handles both automatically.

Question 3

How do inverse trig functions work?

Accepted Answer

Switch to Inverse mode and enter a value between -1 and 1 for arcsin/arccos, or any real number for arctan. The result is the angle whose sin, cos or tan equals that value. For example arcsin(0.5) = 30°.

Question 4

Are these calculations exact?

Accepted Answer

The calculator uses IEEE-754 double precision (about 15-17 significant digits). Results like tan(90°) that are mathematically undefined are reported as very large numbers or infinity.