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По подобию треугольников:
=
X=6*3.8/(7.6+3.8)
X=2
X=6*3.8/(7.6+3.8)
X=2
<span>1) f(x)=sinx-cosx </span>
<span><span>f'(x)=(sinx)' - (cosx)' = cosx - (-sinx) = cosx + sinx </span></span>
<span><span><span>2) f(x)=tgx-4ctgx</span></span></span>
<span>3) f(x)=4x-sinx </span>
<span>f'(x)=(4x)' - (sinx)' = 4 - cosx</span>
<span> <span>4) f(x)=6cosx-1,2x</span></span>
<span><span><span>f'(x)=(6cosx)' - (1,2x)' = -6sinx-1.2</span></span></span>