Choose the correct answer in each of the following questions:
If `sinA + sin^(2)A=1 " then " cos^(2)A+cos^(4)A=?`

Choose the correct answer in each of the following questions: If 2cos 3 theta=1 " then " theta=?

Choose the correct answer in each of the following questions: If sin theta=(a)/(b) " then " cos theta=?

Choose the correct answer in each of the following questions: If sin theta =(1)/(2) " then " cot theta=?

Choose the correct answer in each of the following questions: sqrt((1-sinA)/(1+sinA))=?

Choose the correct answer in each of the following questions: sec^(2)60^(@)-1=?

Choose the correct answer in each of the following questions: If (cos theta + sec theta) =(5)/(2) " then " (cos^(2)theta + sec^(2)theta)=?

Choose the correct answer in each of the following questions: If cos theta =(4)/(5) " then " tan theta=?

Choose the correct answer in each of the following questions: If cos theta =(4)/(5) " then " tan theta=?

Choose the correct answer in each of the following questions: If cos (alpha + beta)=0 " then " sin(alpha -beta)=?

Choose the correct answer in each of the following questions: sin(45^(@)+theta)-cos(45^(@)-theta)=?