упростить выражение ctg^2 t(-1+1/cos^2 t)
ctg²t*(-1+1/cos²t)=ctg²t*(-1+1+tg²t)=ctg²t*tg²t=1.
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ctg²t*(-1+1/cos²t)=ctg²t*(-1+1+tg²t)=ctg²t*tg²t=1.