Q. What is the value of {sin (90 – x) cos [π – (x – y)]} + {cos (90 – x) sin [π – (y – x)]}?
A) -sin y
B) -cos y
C) tan y
D) cos x
✔ Correct Answer: -cos y
Exam Insight
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A) -sin y
B) -cos y
C) tan y
D) cos x
✔ Correct Answer: -cos y
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