msu08

10+ Year Member
7+ Year Member
Nov 14, 2006
60
0
Status
Pre-Dental
tan xdegree = tan (90 – x)degree when



A. x = 0
B. x = -30
C. x = -45
D. x = -60
E. x = -90

answer is C why???
 

adizzle87

10+ Year Member
Jan 26, 2008
844
2
Status
Dental Student
a) tan0 [0] vs tan 90 [1/0]
b) tan(-30) [-1/rad3] vs tan(120) [-rad3/1]
c) tan(-45) [-1] vs tan(135) [-1]

The key is to know your triangles about your unit circle. Knowing the ASTC pnemonic (All Students Take Calculus) helps with getting the angle and signs right as well.
 
About the Ads