1.

Let f(x)=∣∣∣∣∣cos2θtan2θ1−sin2θsec2θ1sin2xtan2x16x∣∣∣∣∣, θ∈(0,π2). Then the value of f′′(π4) is equal to

Answer»

Let f(x)=∣∣
∣
∣
∣
cos2θtan2θ1−sin2θsec2θ1sin2xtan2x16x∣∣
∣
∣
∣
, θ∈(0,π2).
Then the value of f′′(π4) is equal to



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