We can go through options for this question
Option a is wrong because 0 is not included in (-π,0)
At x = -π/4 value of f(x) is -√2 = -1.41
At x = -π/3 value of f(x) is -2.
At x = -π/2 value of f(x) is -1.
∴ f(x) has max value at x =-π/2.
Which is -1.
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