Question

7. Express
i) cos ou in terms of cos 3a; () sin 100 in terms of functions of se:
(i)tan Sa in terms of tan 4o; (iv) cos 20 in terms of cos 40:
50
(v) tan 4 in terms of cos 80: (vi) sin in terms of cos 50:
2
(vi) cos 20 in terms of sin 50.
(Hist. 20 is double of 10 9 and 10 is double of 50. Hence apply double angle formula
15) sin 292​

Answer 1

Answer:

(a)cos in the 100 ×50 = 50000