Establish the identity.cos
= -sin ?
What will be an ideal response?
cos 
= cos 
cos ? + sin 
sin ? = 0 ? cos ? - 1 ? sin ? = - sin ?
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Identify the conic that the polar equation represents. Also, give the position of the directrix.r = 
A. hyperbola, directrix is perpendicular to the polar axis at a distance 
units to the left of the pole
B. hyperbola, directrix is perpendicular to the polar axis at a distance 3 units to the right of the pole
C. ellipse, directrix is perpendicular to the polar axis at a distance 
units to the right of the pole
D. ellipse, directrix is perpendicular to the polar axis at a distance 3 units to the left of the pole
Change the exponential expression to an equivalent expression involving a logarithm.85/3 = 32
A. log328 = 
B. log832 = 
C. log58 = 
D. 
= 8
Use a calculator to find the following. Round your answer to four places past the decimal point. ? sin 25°40' ?
A. 0.5561 B. 0.6191 C. 0.4331 D. 0.4481 E. 0.5781
Add or subtract as indicated.(9 + 7i) - (6 - 2i)
A. 3 + 9i B. 3 - 9i C. 3 - 5i D. 3 + 5i