Упростите:
a)1-[tex]sin ^{2} a-cos ^{2} a[/tex]
б)[tex]cos ^{2} a-(1-2sin ^{2} a)[/tex]
в)[tex]sina*ctga[/tex]
г)[tex]tg a * cos a[/tex]
д)[tex] \frac{sina}{tga} [/tex]
е)[tex]tga*ctga-1[/tex]
ж)[tex]sin ^{2} a-1/1-cos ^{2} a[/tex]
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