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alexeyivanovnk1234
@alexeyivanovnk1234
July 2022
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Помогите пожалуйста 4ое
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Decoration
1.sin^2a+cos^2a=1
sin^2a=1-cos^2a
sin^2a=1-(-1/3)^2
sin^2a=1-1/9
sin^2a=8/9
sina=√8/3
2.cos^2a=1-sin^2a
cos^2a=1-4/25
cosa=√21/5
2 votes
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Answers & Comments
sin^2a=1-cos^2a
sin^2a=1-(-1/3)^2
sin^2a=1-1/9
sin^2a=8/9
sina=√8/3
2.cos^2a=1-sin^2a
cos^2a=1-4/25
cosa=√21/5