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parleFranse
@parleFranse
August 2022
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Срочно!!! Хоть что-нибудь! Очень надо!!! Прошууууууу
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irina00101
3/ tg(a+b)=(tga+tgb)/(1-tgatgb)=(2+1)/(1-2*1)=3/-1=-3
1/ cos70cos10+sin70sin10=cos60
sin50cos10+cos50sin10=sin60
cos60/sin60=ctg60=√3/3
cos(105)=cos(60+45)=cos60cos45-sin60sin45=1/2*√2/2-√2/2*√3/2=√2/4(1-√3)
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mmb1
Verified answer
Соs(a-b)=cos(70-10)=cos60
sin(a+b)=sin(50+10)=sin60
записывай так:
cos(70-10)/sin(50+10)=cos60/sin60= сtq60
0 votes
Thanks 0
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Answers & Comments
1/ cos70cos10+sin70sin10=cos60
sin50cos10+cos50sin10=sin60
cos60/sin60=ctg60=√3/3
cos(105)=cos(60+45)=cos60cos45-sin60sin45=1/2*√2/2-√2/2*√3/2=√2/4(1-√3)
Verified answer
Соs(a-b)=cos(70-10)=cos60sin(a+b)=sin(50+10)=sin60
записывай так:
cos(70-10)/sin(50+10)=cos60/sin60= сtq60