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1=sin^2a+cos^2a
1=1
b) 3-3cos^2a=3sin^2a
3= 3 sin^2a+3cos^2a
3=3(sin^2a+cos^2a)
3=3*1
3=3
1- sin^alfa = cos alfa x cos alfa/sin alfa x sin alfa
1- sin^alfa = cos^alfa
1 = sin^alfa + cos^alfa
1=1
b)
3 = 3sin^alfa + 3cos^alfa
3 = 3(sin^alfa + cos^alfa)
3 = 3
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