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Милкиdtq
@Милкиdtq
July 2022
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Помогите с решением №2 и 3! Очень надо!
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sedinalana
Verified answer
2
a)2sinacosa-sin²a-2sinacosa-cos²a=-(sin²a+cos²a)=-1
b)2sin²a-1=-cos2a
3
cosa=5/13
sina=√(1-cos²a)=√(1-25/169)=√(144/169)=12/13
sin2a=2sinacosa=2*12/13*5/13=120/169
cos2a=cos²a-sin²a=25/169-144/169=-119/169
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Answers & Comments
Verified answer
2a)2sinacosa-sin²a-2sinacosa-cos²a=-(sin²a+cos²a)=-1
b)2sin²a-1=-cos2a
3
cosa=5/13
sina=√(1-cos²a)=√(1-25/169)=√(144/169)=12/13
sin2a=2sinacosa=2*12/13*5/13=120/169
cos2a=cos²a-sin²a=25/169-144/169=-119/169