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Yangi228
@Yangi228
August 2022
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(1+tg^2a) cos^4a+sin^2a=1
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Cos^4a+sin^2a*cos^2a=cos^2a(cos^2a+sin^2a)=cos^2a=1/(1/cos^2a)=1/(1+tg^2a)Так как tga=2, то 1+tg^2a=5 и
cos^4a+sin^2a*cos^2a=1/5
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