f(x)=8sin(x)-5/cos(x)=8sin(x)-5sec(x)
f ' (x)=d/dx(8sin(x)-5sec(x))
f ' (x)=8cos(x)-5sec(x)tan(x)
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f(x)=8sin(x)-5/cos(x)=8sin(x)-5sec(x)
f ' (x)=d/dx(8sin(x)-5sec(x))
f ' (x)=8cos(x)-5sec(x)tan(x)