Question: Answer these Pre-Calculus questions using trigonometry identities, show ALL work and make sure it is clean and organized as well as easy to understand. Thank

$understand. Thank you! \fhe given information to find the exact value of$

Answer these Pre-Calculus questions using trigonometry identities, show ALL work and make sure it is clean and organized as well as easy to understand. Thank you!

\fhe given information to find the exact value of the expression. 21 8) sin a = a lies in quadrant I, and cos B = 5 29 13 B lies in quadrant I Find cos (a + B).Find the exact value under the given conditions. 9) sin a = 21 0

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