Given triangle RST, find cos T.
Cosine rule:
cos T = (r²+s²-t²)/(2rs)
small letters mean length of side opposite angle of capital letter.
example: t=side opposite to angle T
To find cos T, you need to know the lengths of two sides of triangle RST. Specifically, you need the lengths of the side adjacent to angle T and the hypotenuse.
If you have the lengths of these two sides, you can divide the length of the side adjacent to angle T by the length of the hypotenuse to find cos T.
However, if you don't have the lengths of the sides, you won't be able to calculate the exact value of cos T. In that case, you would need additional information, such as angles or other side lengths, to solve for cos T.