8. Triangular & Circular Functions
8.06 Evaluating trigonometric functions: exact values
Interactive practice questions
Consider the expression $\sin135^\circ$sin135°.
a
In which quadrant is $135^\circ$135°?
fourth quadrant
A
first quadrant
B
third quadrant
C
second quadrant
D
b
What positive acute angle is $135^\circ$135° related to?
c
Is $\sin135^\circ$sin135° positive or negative?
positive
A
negative
B
d
Rewrite $\sin135^\circ$sin135° in terms of its reference angle. You do not need to evaluate $\sin135^\circ$sin135°.
Easy
3min
Consider the expression $\cos240^\circ$cos240°.
Easy
1min
Consider the expression $\tan210^\circ$tan210°.
Easy
1min
Consider the expression $\sin\frac{7\pi}{6}$sin7π6.
Easy
2min
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