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4.06 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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