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Жужечка
@Жужечка
June 2022
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решите пожалуйста:
1)-sin^2x-cos^2x-tg^2x
2)cosx tgx/sin^2
3)(tgx+ctgx)^2 - (tgx-ctgx)^2
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Answers & Comments
esmilya
1)-sin^2x-cos^2x-tg^2x =-(sin^2x+cos^2x)-tg^2x = -1-tg^2x=-1/cos^2x
2)cosx tgx/sin^2 = (cosxsinx/cosx)/sin^2x = 1/sin x
3)(tgx+ctgx)^2 - (tgx-ctgx)^2 = tg^2x+tgx*ctgx+ctg^2x - tg^2x +tgx*ctgx - ctg^2x = 2
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Answers & Comments
2)cosx tgx/sin^2 = (cosxsinx/cosx)/sin^2x = 1/sin x
3)(tgx+ctgx)^2 - (tgx-ctgx)^2 = tg^2x+tgx*ctgx+ctg^2x - tg^2x +tgx*ctgx - ctg^2x = 2