What is the identity matrix of size 3?
A. 
.
B. 
.
C. 
.
D. 
.
Answer: C
Mathematics
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Solve the problem.
=
A. 26 B. 336 C. 56 D. 6720 E. none of these
Mathematics
Find the length of the missing side of the right triangle. Round to three decimal places, if necessary. The legs of the right triangle are represented by a and b, and the hypotenuse is represented by c.b = 3, c = 
A. a = 3.162 B. a = 18.762 C. a = 4.162 D. a = 5.292
Mathematics
Use a calculator to find the function value. Give your answer rounded to seven decimal places, if necessary.sin (-34°20')
A. -0.5640066 B. -0.5620834 C. -0.5562956 D. -0.5543603
Mathematics
Find the exact value of the following expression without using a calculator.sin 0°
A. 0
B. 
C. 1
D. 
Mathematics