Answer:
Step-by-step explanation:
<u>Use identities to set the equation up as a quadratic</u>
<u>Make the substitution u=cos(x) and solve the quadratic</u>
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Hence,
Answer: B and C
Answer: Mohammed is correct
A) 21
Mean:
(23 + 18 + 24 + 15 + 25)/5
105/5
21