1. -tga*cosa+sina=-sina/cosa*cosa+sina=-sina+sina=0
2. cosa-cosa/sina*sina=cosa-cosa=0
3. (-cosa+sina)/(cosa+sina)*(cosa-sina)=-1/cosa+sina
4. tga*ctga+(cos^2a+sin^2a)=1+1=2
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Answers & Comments
1. -tga*cosa+sina=-sina/cosa*cosa+sina=-sina+sina=0
2. cosa-cosa/sina*sina=cosa-cosa=0
3. (-cosa+sina)/(cosa+sina)*(cosa-sina)=-1/cosa+sina
4. tga*ctga+(cos^2a+sin^2a)=1+1=2