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Question

If
f(x)=∣ ∣ ∣cos(x+x2)sin(x+x2)cos(x+x2)sin(xx2)cos(xx2)sin(xx2)sin(2x)0sin(2x2)∣ ∣ ∣
find f(0)

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Solution

f(x)=∣ ∣ ∣cos(x+x2)sin(x+x2)cos(x+x2)sin(xx2)cos(xx2)sin(xx2)sin(2x)0sin(2x2)∣ ∣ ∣differentiatingw.r.txwegetf(x)=(1+2x)∣ ∣ ∣sin(x+x2)cos(x+x2)sin(x+x2)sin(xx2)cos(xx2)sin(xx2)sin(2x)0sin(2x2)∣ ∣ ∣+(12x)∣ ∣ ∣cos(x+x2)sin(x+x2)cos(x+x2)cos(xx2)sin(xx2)cos(xx2)sin(2x)0sin(2x2)∣ ∣ ∣+2∣ ∣ ∣cos(x+x2)sin(x+x2)cos(x+x2)sin(xx2)cos(xx2)sin(xx2)cos(2x)02xcos(2x2)∣ ∣ ∣f(0)=∣ ∣010010000∣ ∣+∣ ∣101101000∣ ∣+2∣ ∣101010100∣ ∣=0+0+2(1)=2

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