Q1. Evaluate: sin2 pi/8+sin2 3pi/8+sin2 5pi/8+sin2 7pi/8
Q2. Evaluate: sin2 pi/4+sin2 3pi/4+sin2 5pi/4+sin2 7pi/4
Q3. Evaluate: tan pi/12.tan pi/16.tan 5pi/12.tan 7pi/16
Q4. Find y from the following equation: cosec (pi/2+x) + y cos x cot (pi/2+x)=sin (pi/2+x)
Q5. If 8x = pi, show that: cos 7x+cos x =0
Q6. If tan 25 degree = x , prove that (tan 155 degree - tan 115 degree) / (1+ tan 155 degree tan 115 degree )= (1-x2 ) / 2x
Dear Vaishali, We cater to queries of lakhs of students. So, in future please post queries separately and not more than three at a time. Please post questions 1 to 3 seperately, as a new query. We will solve them immediately.
Thanks