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Джексон13
@Джексон13
July 2022
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Найдите sin2 (a),если sin (a) - cos (a) = 0,3
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Samirka98
(sina-cosa)^2=(0.3)^2
sin2a-2sinacosa+cos^2a=0.09
1-sin2a=0.09
sin2a=1-0.09
sin2a=0.91
4 votes
Thanks 2
Samirka98
На второй строчке не sin2a, а sin^2a
Samirka98
2sinacosa=sin2a
Samirka98
sin^2a+cos^2a=1
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Answers & Comments
sin2a-2sinacosa+cos^2a=0.09
1-sin2a=0.09
sin2a=1-0.09
sin2a=0.91