For any angle {{MATH_15}} measured in radians, the derivative of {{MATH_16}} with respect to {{MATH_17}} is {{MATH_18}}. In other words, {{MATH_19}} {{CMD_20}} Using the definition of the derivative, write with me {{MATH_21}} Now we get sneaky and apply the trigonometric addition formula for sine, that says {{MATH_22}}, to write {{ENV_23}} {{CMD_24}} {{CMD_25}}