Find the exact value by using a sum or difference identity.tan 345°

A. -  - 2
B. -  + 2
C.  - 2
D.  + 2

Answer: C

Mathematics

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Integrate the function.

A.  + C
B. tan-1 4x -  + C
C. ln  + C
D.  tan-1 4x +  + C

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Mathematics

The triangles are similar. Find the angle or side that corresponds to the given angle or side in the other triangle.AC

A. ST B. RT C. RS D. Cannot be determined

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Factor out the greatest common factor.21x4 - 9x3 + 15x2

A. 3x(7x3 - 3x2 + 5x) B. 3(7x4 - 3x3 + 5x2) C. 3x2(7x2 - 3x + 5) D. x2(21x2 - 9x + 15)

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Mathematics

Use an analytic method to solve the equation. = 

A. {0, 2} B. {0, 4} C. {-4} D. ?

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Mathematics