Find the exact value of each of the following under the given conditions. 4 元 4165 元 sin α = 5' <; cos ẞ= - ' 65 2 <ß<0 (a) sin (α +ẞ) (b) cos (α+ẞ) (c) sin (α-ẞ) (d) tan (α-ẞ)

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