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<span>в) 7d/16 =21с/48 и 43с/48
г)8t^2/35=80t²/350 и 7х^2/50=49x²/350
д)n/m^2=n³/m²n² и m/n^2 =m³/m²n²
е)3c^2/5t=3c³/5tc и t^2/5c
=t³/5tc</span>
Y`=2cos2x/2√(16+sin2x)=cos2x/√(16+sin2x)=0
cos2x=0⇒2x=π/2∉[-π/3;π/3]
y(-π/3)=√(16-√3/2) наим
y(π/3)=√(16+√3/2)