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Find the exact value of Cosine (alpha + beta) given sin Alpha = two-fifths for Alpha in Quadrant II and Cosine Beta = one-third for Beta in Quadrant IV.

Find the exact value of Cosine (alpha + beta) given sin Alpha = two-fifths for Alpha in Quadrant II and Cosine Beta = one-third for Beta in Quadrant IV. class=

Answer :

Answer:

D on Edge

Step-by-step explanation:

4√2 -√21 divided by 15

Answer:

D

Step-by-step explanation:

right on Edge

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