Use the accompanying table to find the solutions to the given equation on 
cos ? - sin ? cos ? = 0
Y1 = cos(X)-sin(X)cos(X)
A. 0°, 180°
B. 90°, 180°
C. 45°, 135°, 225°, 315°
D. 90°, 270°
Answer: D
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Identify the property illustrated by the statement.12 ? 15 is a real number.
A. Inverse property of multiplication B. Closure property C. Multiplicative identity D. Associative property
Solve the equation. Express radicals in simplest form.2x2 = 30
A. {16}
B. {15}
C. {-
, 
}
D. {-15, 15}
Use the product-to-sum or sum-to-product identities to find an identity for the given expression.sin 14? sin 9?
A. 
(cos -5? + cos 23?)
B. 
(cos -5? - cos 23?)
C. cos -5? - cos 23?
D. 
(sin -5? - sin 23?)
A multiple-choice test offers four possible answers for every question, of which only one is the correct answer. A student guesses on five of the questions. What is the probability that she gets exactly two of the guessed questions correct?
What will be an ideal response?