I really don't know. I must of been smoking something(hehehe)danago said:
The basic trigonometric ratios are the sine, cosine, and tangent. These ratios are defined as the ratio of the sides of a right triangle, with the hypotenuse being the longest side, the opposite side being the side opposite the angle of interest, and the adjacent side being the side adjacent to the angle of interest.
To find the value of a trigonometric ratio, you must know the length of two sides of a right triangle. The ratio can then be calculated by dividing the length of the opposite or adjacent side by the length of the hypotenuse.
Double angle identities are trigonometric identities that involve doubling the measure of an angle. These identities are useful for simplifying trigonometric expressions and solving equations involving trigonometric functions.
To use double angle identities, you must first identify the angle that needs to be doubled. Then, use the appropriate identity to simplify the expression or equation. It is important to remember to substitute the original angle back into the simplified expression to get the final answer.
The relationship between trigonometric ratios and double angles is that double angle identities can be used to express trigonometric ratios in terms of double angles. This can be helpful in solving equations involving trigonometric ratios or finding the value of a trigonometric ratio for a given double angle.