To calculate the values of sin(30°) and cos(30°), remember that those angles appear in the special 30°, -60°, -90° right triangle. Let's say that the hypotenuse of that triangle is 1 cm long. The shortest side will be then 0.5 cm long. Use the trigonometry theorems in right triangles to find the value of sin(30°): For the most part, you will NEVER have to deal with negative powers of trig functions. Squares, definitely - but never negative values. So if you ever see that -1 after sin, cos, or tan, just remember it represents ARCsin, ARCcos, and ARCtan and NOT the reciprocal trig functions. It means to determine if the value of a trigonometric function is positive or negative; for example, since sin(3π 2) = − 1 < 0, its sign is negative, and since cos( − π 3) = 1 2 > 0, its sign is positive. I hope that this was helpful. Wataru · 2 · Nov 6 2014. Step 5: Determine the value of tan. The tan is equal to sin divided by cos (tan= sin/cos). For example, for 0°. Tan 0° = 0/1 = 0. By dividing all the angles with the value of tan you will get the below values. Angles (In Degrees) 0°. We use sin, cos, and tan functions to calculate the angles. The degrees used commonly are 0, 30, 45, 60, 90, 180, 270 and 360 degrees. We use these degrees to find the value of the other trigonometric angles like the value of sine 15 degrees. Precalculus 10 units · 131 skills. Unit 1 Composite and inverse functions. Unit 2 Trigonometry. Unit 3 Complex numbers. Unit 4 Rational functions. Unit 5 Conic sections. Unit 6 Vectors. Unit 7 Matrices. Unit 8 Probability and combinatorics. G5xUbEA.

cos tan sin values