Question Function Evaluate the derivative Find the domain Find the x-intercept/zero Load more f′(x)=−2sin(x) Evaluate f(x)=2cos(x)−1Take the derivative of both sides f′(x)=dxd(2cos(x)−1)Use differentiation rule dxd(f(x)±g(x))=dxd(f(x))±dxd(g(x)) f′(x)=dxd(2cos(x))−dxd(1)Calculate More Steps Calculate dxd(2cos(x))Simplify 2×dxd(cos(x))Use dxd(cosx)=−sinx to find derivative 2(−sin(x))Calculate −2sin(x) f′(x)=−2sin(x)−dxd(1)Use dxd(c)=0 to find derivative f′(x)=−2sin(x)−0Solution f′(x)=−2sin(x) Show Solution Graph
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