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neka31rus
@neka31rus
November 2021
1
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Третий номер с решением
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TARTILLO
Verified answer
A) sin(a)=√(1-cos²(a) = √(1-(-0,6)²)=0,8
b)
sin(2a)=2cos(a)sin(a) = 2(-0,6)=0,8=-0,96
c) cos
(2a)=cos
²
(a)-sin
²
(a) = (-0,6)
²-(0
,8)
²
= 0,36-0,64= - 0,18
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Answers & Comments
Verified answer
A) sin(a)=√(1-cos²(a) = √(1-(-0,6)²)=0,8b) sin(2a)=2cos(a)sin(a) = 2(-0,6)=0,8=-0,96
c) cos(2a)=cos²(a)-sin²(a) = (-0,6)²-(0,8)²= 0,36-0,64= - 0,18