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Portes228
@Portes228
August 2022
2
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Упростите:
(1-cost)(1+cost)=
sin^2t+2cos^2t-1=
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lidusya13
Verified answer
1)=1-cos^2 t=sin^2 t;
2)=sin^2 t+2 cos^2 t- sin^2t-cos^2t=cos^2t
2 votes
Thanks 15
laymlaym2
Verified answer
Парочка формул:
cos²x+sin²x=1
2cos²x-1=cos²x-sin²x(=cos2x)
1) (1-cost)(1+cost)=1²-cos²t=sin²t
2) sin²t+(2cos²t-1)=sin²t+cos²t-sin²t=cos²t
8 votes
Thanks 13
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Answers & Comments
Verified answer
1)=1-cos^2 t=sin^2 t;2)=sin^2 t+2 cos^2 t- sin^2t-cos^2t=cos^2t
Verified answer
Парочка формул:cos²x+sin²x=1
2cos²x-1=cos²x-sin²x(=cos2x)
1) (1-cost)(1+cost)=1²-cos²t=sin²t
2) sin²t+(2cos²t-1)=sin²t+cos²t-sin²t=cos²t