Cos theta: What is the relation

What is the relation among all the trigonometrical ratios of (90° - θ)? In trigonometrical ratios of angles (90° - θ) we will find the relation between all six trigonometrical ratios. Learn how to use trigonometric identities to simplify expressions involving sine, cosine and tangent functions. Find out how to use the magic hexagon, Pythagoras' theorem and other identities to solve problems. Learn about the equalities that involve trigonometric functions and are true for every value of the variables. Find the Pythagorean, reflection, shift, periodicity, sum and difference identities for sin, cos, tan and other functions. The fundamental cos theta formula that you use for calculating the cosine is cosθ = base/hypotenuse Here, The base is known to be the base of the triangle, while the hypotenuse is the side opposite to the right angle of the triangle. If θ is one of the acute angles of the triangle, then sinθ is the ratio of the opposite side of the hypotenuse, and the cosec is the ratio of the adjacent side to the hypotenuse. The cosine directly relates to the right-angle triangle, and the calculation of ...