The tangent equation of F (x) = cosx at x = π / 6 and y = SiNx at a (π / 6,1 / 2) is I don't know much about it,

The tangent equation of F (x) = cosx at x = π / 6 and y = SiNx at a (π / 6,1 / 2) is I don't know much about it,

The slope of the tangent is the derivative of the function at the tangent point
f'(x)=-sinx
f'(π/6)=-sin(π/6)=-1/2
Generally speaking, the tangent equation is determined according to the tangent point and tangent slope
y'=cosx
y'(A)=cos(π/6)=√3/2
The tangent equation is Y-1 / 2 = √ 3 / 2 (x - π / 6)