Hey i have this equation;
a² + b² - 2abCos Ѳ = c² + d² - 2cdCos ø
and i need to show that dѲ/dø = cd sinø / ab sinѲ
im not quite sure how to do this
i think that the 1st one goes to 2a + 2b + 2absinѲ
and the 2nd one goes to 2c + 2d + 2cdsinø
but im stuck from there
The numbers and are just constants. The derivative of a constant is zero. . The same is true for . Remember that a derivative is a rate of change with respect to some variable. In this case the variable is . So the only part of the equation that changes with respect to is . The constants don't change (by definition of a constant), so their derivatives are zero.