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BrainS711
@BrainS711
August 2021
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Помогите Решить Математику!
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ПрофиЗнания
3) sin^2a/cos^2a * cos^2a + cos^2a/sin^2a * sin^2a = sin^2a+cos^2a=1
2)ctga=8/15
tga*ctga=1
tga=1*15/8
1+tg^2a= 1/ cos^2a
1+225/64 = 1/cos^2a
289/64=1/cos^2a
cos^2a=64/289
cosa=8/17
sina=√1-64/289 = √225/289=15/17
1)sin^2a/cos^2a - sin^2a = sin^2a * sin^2a/cos^2a
sin^2a-sin^2acos^2a / cos^2a = sin^4a/cos^2a
sin^2a(1-cos^2a)/cos^2a=
sin^4a/cos^2a
sin^2a*sin^2a/cos^2a =
sin^4a/cos^2a
sin^4a/cos^2a=
sin^4a/cos^2a
0 votes
Thanks 1
BrainS711
3 , это 1 номер ?
ПрофиЗнания
я с конца начал решал третий это третий
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Answers & Comments
2)ctga=8/15
tga*ctga=1
tga=1*15/8
1+tg^2a= 1/ cos^2a
1+225/64 = 1/cos^2a
289/64=1/cos^2a
cos^2a=64/289
cosa=8/17
sina=√1-64/289 = √225/289=15/17
1)sin^2a/cos^2a - sin^2a = sin^2a * sin^2a/cos^2a
sin^2a-sin^2acos^2a / cos^2a = sin^4a/cos^2a
sin^2a(1-cos^2a)/cos^2a= sin^4a/cos^2a
sin^2a*sin^2a/cos^2a = sin^4a/cos^2a
sin^4a/cos^2a= sin^4a/cos^2a