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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 twofifths for Alpha in Quadrant II and Cosine Beta onethird for Beta in Quadrant IV class=

Respuesta :

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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