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Question

Let y=4sinx+cos2x+3 then

A
graph of y lies above y=1
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B
graph of y lies above y=5
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C
graph of y lies below y=5
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D
graph of y lies below y=13
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Solution

The correct options are
B graph of y lies above y=5
D graph of y lies below y=13
y=4sinx+12sin2x+3

=42(sin2x2sinx)

=62(sinx1)2

ymax=6

ymin=2

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