I need help with the following proofs.
a.) cos(nθ)=cos((n-2)θ)-2sinθsin((n-1)θ)
b.) (sin(x/2)+sin(x))/(cos(x/2)-cos(x))=cot(x/4)
c.) (sin∝-cos∝+1)/(sin∝+cos∝-1)=(sin∝+1)/cos∝
d.) tan(x/2)=(1-cos(x)+sin(x))/(1+cos(x)+sin(x))
Jezreel owns a triangular residential lot bounded by two streets which intersect at 52 degrees 30'. The sides of the lot along the streets are 16 and 35 meters respectively. Find the length of the fence needed to enclose it.
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