Упростите выражение
1) 1-sin^2(51)
2) -2cos^2B-2sin^2B
3) 1/1+ctg^2(40°)
4) ctg^2(3°)+1
1) 1-sin^2(51)
2) -2cos^2B-2sin^2B
3) 1/1+ctg^2(40°)
4) ctg^2(3°)+1
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Answers & Comments
2) -2+2sin^2b-2sin^2b=-2
3) (cos^2(40)-sin^2(40))/sin^2(40)=-cos^2(40)
4)1/sin^2(3)