Recall the sum and difference formula for the cosine of an angle which states that, cos(uv)...

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Recall the sum and difference formula for the cosine of an angle which states that, cos(uv) = (cos u) (cos v) + (sin u) (sin v) To find the value of cos(u - v), first find the values of sin v and cos u. Note that you are given the values of sin u and cos v. Given that both u and v are in Quadrant II and sin u = and cos v = - -draw a 13 and mark the appropriate sides and angles. right triangle in Quadrant II to reflect sin u = 13 It is given that sin u = Therefore the length of the hypotenuse and another side of this triangle are 13. known. Hypotenuse= opposite side Recall the sum and difference formula for the cosine of an angle which states that, cos(uv) = (cos u) (cos v) + (sin u) (sin v) To find the value of cos(u - v), first find the values of sin v and cos u. Note that you are given the values of sin u and cos v. Given that both u and v are in Quadrant II and sin u = and cos v = - -draw a 13 and mark the appropriate sides and angles. right triangle in Quadrant II to reflect sin u = 13 It is given that sin u = Therefore the length of the hypotenuse and another side of this triangle are 13. known. Hypotenuse= opposite side

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