A) 4
B) 3
C) 7
D) 5
Correct Answer: A
Solution :
\[4{{\sin }^{2}}x+3{{\cos }^{2}}x\] \[4{{\sin }^{2}}x+3\,(1-{{\sin }^{2}}x)\] \[4{{\sin }^{2}}x+3-3\,\,{{\sin }^{2}}x\] \[{{\sin }^{2}}x+3\] maximum value of \[\sin x\] is 1 at \[x=\pi /2\] So, \[{{(1)}^{2}}+3=4\]You need to login to perform this action.
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