If x = a (cosθ + log tanθ/2) and y = a sinθ, show that the value of d²y/dx² at θ = π/4

if x=a(cos theta + log tan theta/2) and y=asin theta , show that the value of d^2y/dx^2 at pi/4
If x = a (cos θ + log tan θ/2) and y = a sin θ, show that the value of d2y/dx2 at θ = π/4 is 2√2/a
If x = a{cos θ + log tan(θ/2)} and y = a sin θ, then dy/dx is equal to
If x = a ( cos theta + log tan theta/2 ) and y = a sin theta, show that the value of d2y/dx2 at theta =pai/4 is 4/a
if x=a sin t and y=a(cos t+log tan(t)/(2)) find (d^(2y)/(dx^(2))
If x = a sin t and y = a (cos t + log tan t/2 ), then find d^2y/dx^2.
If x = a sin t and y = a (cost+log tan(t/2)) ,find ((d^2y)/(dx^2))
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