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KlonDD
@KlonDD
August 2022
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[tex] \frac{1}{1+tg^2x} = \frac{1}{1+ctg^2x} [/tex]
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gulagulap
.........……☺️☺️☺️.............
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Thanks 1
KlonDD
расскажите, пожалуйста, почему из cos²x-sin²x=0 получается cos2x=0 ?
gulagulap
по формуле двойного угла:cos2x=cos^2x-sin^2x
KlonDD
спасибо большое
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