10 класс.Тригонометрия.
27.50(a)
2cosx=sin45/cos135
2cosx=sin45/cos(180-45)
2cosx=sin45/cos45
2cosx=tg45
2cosx=1
cosx=1/2
x=+-arccos1/2+2pn,neZ
x=+-p/3+ 2pn,neZ
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27.50(a)
2cosx=sin45/cos135
2cosx=sin45/cos(180-45)
2cosx=sin45/cos45
2cosx=tg45
2cosx=1
cosx=1/2
x=+-arccos1/2+2pn,neZ
x=+-p/3+ 2pn,neZ