1.tga*ctg-cos^2a=
2.sin^3a+sina*cos^2a\tga=
3.sin^2a+2cos^2a-1=
4.3sin0+2cos0=
5.1+tg(3 pi\2+a)*sina
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1.tga*ctg-cos^2a=
2.sin^3a+sina*cos^2a\tga=
3.sin^2a+2cos^2a-1=
4.3sin0+2cos0=
5.1+tg(3 pi\2+a)*sina
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Answers & Comments
1. (sin a/ cos a )(cosa/sina)-cos^2 a = 1- cos^2 a=sin^2 a
3. Sin ^2 a+ 2 cos ^2 a -1
sin^2 a= 1 - cos^2 a, поэтому : 1-cos^2 a +2 cos^2 a -1=cos^2a
4. sin 0=1
cos 0=1 3*1+2*1=5