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Автор - hast88

Помогите с решением!
7 и 9!
Заранее спасибо!

Ответ

Автор - julyap
arctg(-1)=-arctg1=- frac{ pi }{4}   \ arcsin(- frac{ sqrt{2} }{2} )=-arcsin frac{ sqrt{2} }{2} =- frac{ pi }{4}    \ -frac{ pi }{4} =-frac{ pi }{4}  \  \ arctg(-1)=arcsin(- frac{ sqrt{2} }{2} )

( frac{3}{5} ) ^{2x} = (frac{25}{9} ) ^{-3}  \  \ ( frac{3}{5} ) ^{2x} = (frac{9}{25} ) ^{3}   \  \ ( frac{3}{5} ) ^{2x} = (frac{3}{5} ) ^{6}   \  \ 2x=6\x=3

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