Trigonometric Identities Question 155
Question: The value of $ \cos (270{}^\circ +\theta ),\cos (90{}^\circ -\theta )-\sin (270{}^\circ -\theta ),\cos \theta $ is
[Karnataka CET 2005]
Options:
A) 0
B) -1
C) 1/2
D) 1
Show Answer
Answer:
Correct Answer: D
Solution:
$ \cos (270+\theta )\cos (90-\theta )-\sin (270-\theta )\cos \theta $ $ =\sin \theta .\sin \theta +\cos \theta .\cos \theta =1 $ .
BETA
