1. (1 + sin x ) (1-sin x)
2. (cos x - 1) (1 + cos x)
3. cos^2 x - sin^2 x +1
4. 1 + sin^2 x - cos^2 x
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1. (1 + sin x ) (1-sin x)
2. (cos x - 1) (1 + cos x)
3. cos^2 x - sin^2 x +1
4. 1 + sin^2 x - cos^2 x
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1. ФОРМУЛА
1±sinx=(cos(x/2)±sin(x/2))²
2. 1 - cos ² x = sin ² x
1 - cos ² x = sin ² x 4. по формуле также делаешьsin^2X + cos^2X = 1
=sin^2X + cos^2X
=sinXsinX+cosXcosX
=cos(X-X)
=cos0
=1