4) 2cosx=-1
cosx=-1/2
x=±2π/3+2πn, nєZ Д
5) y'= -7x⁵+20x³ В
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4) 2cosx=-1
cosx=-1/2
x=±2π/3+2πn, nєZ Д
5) y'= -7x⁵+20x³ В