Упростить выражение:
1) [tex] \frac{1}{cos^2a} -tg^2a-sin^2a
[/tex]
2) [tex] \frac{1}{cos^2a} -tg^2a(cos^2a+1)
[/tex]
3) [tex] \frac{sina}{1+cosa} + \frac{sina}{1-cosa} [/tex]
1) [tex] \frac{1}{cos^2a} -tg^2a-sin^2a
[/tex]
2) [tex] \frac{1}{cos^2a} -tg^2a(cos^2a+1)
[/tex]
3) [tex] \frac{sina}{1+cosa} + \frac{sina}{1-cosa} [/tex]
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1)2)
3)