Sine, Cosine and Tangent are the main functions used in Trigonometry and are based on a Right-Angled Triangle. Before getting stuck into the...

In trigonometry, trigonometric identities are equalities that involve trigonometric functions and are true for every value of the occurring variables for which both sides of the equality are defined. Geometrically, …

Then the cosine formula is, cos x = (adjacent side) / (hypotenuse), where "adjacent side" is the side adjacent to the angle x, and "hypotenuse" is the longest side (the side opposite to the right angle) of …

Jul 23, 2025 · The sum and difference identities are the formulas that relate the sine, cosine, and tangent of the sum or difference of two angles to the sines, cosines, and tangents of the individual …

Feb 4, 2025 · Learn about the cosine function in math. Get its definition, formula, and examples in trigonometry, geometry, and calculus.

In a right triangle ABC the cosine of α, cos (α) is defined as the ratio betwween the side adjacent to angle α and the side opposite to the right angle (hypotenuse):

Feb 24, 2025 · The derivative of sinx is cos x. By applying the value of x (in degrees or radians) to cos x, the slope of the tangent to the sinx curve at that point can be determined.