2*81^х+1 - 36^х+1 -3*16^х+1=0 25*9^х -34*15^х + 9*25^х=0
2*16^сosx -20^cosx=3*25^cosx
Решить уравнения.
^ - знак показателя.
Все подробно.
Плиз***
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