Trigonometry

Angle modes, sine, cosine, tangent, their inverses and triangles.

• Set degrees or radiansTell the calculator whether angles are measured in degrees or radians before you use sin, cos or tan.
• Find sine, cosine and tangentGet sin, cos or tan of an angle, here sin 50, cos 50 and tan 50 in degrees.
• Find an angle from a ratioUse the inverse trig functions (sin⁻¹, cos⁻¹, tan⁻¹) to turn a ratio back into an angle.
• Convert between degrees and radiansChange an angle from degrees to radians and back with the calculator.
• Solve a right triangleFind a missing side from the hypotenuse and an angle, and a missing angle from two sides.
• Use the law of sinesFind a side of any triangle when you know the opposite angle of another side and its length.
• Use the law of cosinesFind the third side of a triangle when you know two sides and the angle between them.
• Graph a sine wavePlot y = sin(x) in a trig-friendly window and find its peak at x = π ÷ 2.
• Secant, cosecant and cotangentGet sec, csc and cot by taking the reciprocal of cos, sin and tan.
• Convert between polar and rectangularTurn a point (x, y) into a distance r and an angle θ.
• Check unit circle valuesFind the exact values of sin, cos and tan at 30, 45 and 60 degrees.
• Hyperbolic functionsFind sinh, cosh and tanh with the hyperbolic menu.
• Solve any triangle with the solver toolUse the Triangle solver in the Reference library when you know three parts of a triangle and want the rest, drawn to scale.