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[tex] \frac{cos ^{2} \beta -sin \beta }{cos \beta } +tg \beta [/tex]
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[tex] \frac{cos ^{2} \beta -sin \beta }{cos \beta } +tg \beta [/tex]
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((cos^2b-sinb)/cosb)+(sinb/cosb)=(cos^2b-sinb+sinb)/cosb=cos^2b/cosb=cosbОтвет: cosb