1.

Let=cos x sin 2x , then-

Answer»

min `f(X)GT-(7)/(9),x in[-pi,pi]`
min `f(x)gtgt-(9)/(7),x in [ -pi,pi]`
min `f(x)gt-(1)/(8) x in [-pi,pi]`
min `f(x)gt-(2)/(9), x in[pi,pi]`

Answer :A,B


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