express and evaluate : 1)sin99°-sin81°
2) cos4 theta+ cos 8 theta
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using c and d results
2 cos(99+81)/2 sin(99-81)/2
2 cos 90 sin9
0
using c and d results
2 cos(99+81)/2 sin(99-81)/2
2 cos 90 sin9
0
jaywantvichare8014:
plz give me second question's solution
use again c and d results
rest is the answer
ok
ans is 2cos6theta cos2 theta
if u say i send the solution
thanks
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