Trigonometric Identities Question 212
Question: $ \cos A+\sin (270{}^\circ +A)-\sin (270{}^\circ -A)+\cos (180{}^\circ +A)= $
[MP PET 1990]
Options:
A) -1
B) 0
C) 1
D) None of these
Show Answer
Answer:
Correct Answer: B
Solution:
$ \cos A+\sin (270{}^\circ +A)-\sin (270{}^\circ -A)+\cos (180{}^\circ +A) $ = $ \cos A-\cos A+\cos A-\cos A=0 $ .
BETA
