Q. 154.5( 2 Votes )
The value of cos230° – sin230° is
A. cos 60°
B. sin 60°
C. 0
D. 1
Answer :
We know, 
So, 
⇒ 
Comparing the above result with the given options, we find that
A. is the correct option because, 
B. is incorrect because, 
C. is incorrect because,
D. is incorrect because,
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