If sin a =
show that (3 cos a -4cos'a) = 0.
2.
Answers
Answered by
0
Answer:
incomplete question
Step-by-step explanation:
the value of sin a is not given
Answered by
0
Answer:
Let theta be ₹.
sin ₹ = 1/2
sin ₹ = sin 30°
₹ = 30°
to prove:-
3cos₹ - 4cos^3₹ = 0
3cos30° - 4cos^3 30° = 0
3( \sqrt{3} /2) - 4( \sqrt{3} /2)^{3} = 03(
3
/2)−4(
3
/2)
3
=0
0 = 0
Hence Proved
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