A point lying on the terminal side of angle ? is given. Find the exact value of the indicated trigonometric function of ?.(15, 20) Find cos ?.
A. 
B. 
C. 
D. 
Answer: B
Mathematics
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Factor the trinomial completely. If the polynomial cannot be factored, write "prime."x2 + 20x + 21
A. prime B. (x + 21)(x - 1) C. (x + 21)(x + 1) D. (x + 7)(x + 3)
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Multiply.(x - 5)(x + 5)(x2 - 25)
A. x4 - 50x2 + 625 B. x4 - 625 C. x4 - 25x2 - 625 D. x4 - 10x2 + 25
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Find the measures of the numbered angles in the figure below.
Mathematics