Question

please send answers urgent

Answer 1

8. 420cm3
9. 1/26
10. Tan2 + tan4 = sin2/cos2 + sin4/cos4
= sin2/cos2 *( 1+ sin2) /cos2
=( 1 - cos2) / cos2 *(cos2 + sin2) /cos2
=(1 - cos2) / cos2 * 1/cos2
= 1/cos4 - cos2/cos4
= sec4 - sec2
11. 16/20 4/5
13. In quad POQA
ANGLE ( A + P +O +Q) = 360
Angle A = 360 - 90 - 90 - 120
= 60
Sry I couldn't give pic for 12th because of slow net
Hope it helps