August 2022 1 41 Report
Упростите
[tex] \frac{1-2 cos^{2}a }{sina-cosa} [/tex]

[tex] \frac{ sin^{2}a }{1+cosa} + cosa [/tex]


Докажите тождество
[tex] \frac{ cos^{2}a - sin^{2}a }{cosa + sina} + tga * cosa = cosa [/tex]

[tex] \frac{1- cos^{2}a + tg^{2}a * cos^{2}a }{ sin^{2}a } = 2[/tex]
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