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nastyavetka15
@nastyavetka15
July 2022
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1.Спростіть вираз cos(a+b)-cos a*cos b /sin a*sin b
2. cos^2x=3cos x
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irinan2014
Verified answer
Решение дано на фото.
2 votes
Thanks 2
nastyavetka15
Ти моє спасіння, лове тебе
sedinalana
1
(сosacosb-sinasinb-cosacosb)/sinasinb=-sinasinb/sinasinb=-1
2
cos²x-3cosx=0
cosx*(cosx-3)=0
cosx=0⇒x=π/2+πk,k∈z
cosx-3=0⇒cosx=3>1 нет решения
1 votes
Thanks 1
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Answers & Comments
Verified answer
Решение дано на фото.1
(сosacosb-sinasinb-cosacosb)/sinasinb=-sinasinb/sinasinb=-1
2
cos²x-3cosx=0
cosx*(cosx-3)=0
cosx=0⇒x=π/2+πk,k∈z
cosx-3=0⇒cosx=3>1 нет решения