Determine the value of int 0 frac pi 2 -2cos x ... - JAMB Mathematics 2007 Question
Determine the value of (\int_0 ^{\frac{\pi}{2}
}(-2cos x)dx)
A
-2
B
-1/2
C
-3
D
-3/2
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Correct Option: A
(\int_0 ^{\frac{\pi}{2}}(-2cos x)dx = [-2sin x + c]_0 ^{\frac{\pi}{2}}\
=(-2sin\frac{\pi}{2}+c+2sin0-c)\
=-2sin90+c+2sin0-c\
=-2(1)+2(0)\
=-2)
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