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aniyn
@aniyn
July 2022
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Удачник66
Verified answer
1 - 2sin 50 = 1/2*cos^(-1) 160 = 1/(2cos 160) = -1/(2cos 20) = -1/(2sin 70)
4sin 50*sin 70 - 2sin 70 = 1
2(cos(-20) - cos 120) - 2sin 70 = 1
2cos 20 - 2(-1/2) - 2cos 20 = -2(-1/2) = 1
Все верно
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Answers & Comments
Verified answer
1 - 2sin 50 = 1/2*cos^(-1) 160 = 1/(2cos 160) = -1/(2cos 20) = -1/(2sin 70)4sin 50*sin 70 - 2sin 70 = 1
2(cos(-20) - cos 120) - 2sin 70 = 1
2cos 20 - 2(-1/2) - 2cos 20 = -2(-1/2) = 1
Все верно