1) 1)cos^2a+cos^2(90-a) = cos^2a+sin^2a = 1
2) sin^2a-cos^2(90-a) = sin^2a-sin^2a = 0
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1) 1)cos^2a+cos^2(90-a) = cos^2a+sin^2a = 1
2) sin^2a-cos^2(90-a) = sin^2a-sin^2a = 0