What is the formula for cosine

What is always true about a positive integer raised to a negative odd power?

Find the equation of a line that is perpendicular to line g that contains (p, q). coordinate plane with line g that passes through the points negative 3 comma 6 and 0 comma 5 3x − y = 3p − q 3x + y = q − 3p x − y = p − q x + y = q − p

What is the ordered pair of m’ after point m (5, 6) is rotated 90° counterclockwise?