Sin 3A = 3 sinA-4
sin³A.
Answers
Answered by
1
Answer:
sin(3a)
sin(2a+a)
=sin2a.cosa+cos2a.sina
=2sina.cosa.cosa+(cos²a-sin²a)sina
=2sina.cos² a+sina-2sin³a
=2sina(1-sin²a)+sina-2sin³ a
=2sina-2sin³a+sina-2sin³a
=3sin-4sin³a
Answered by
0
Step-by-step explanation:
Sin 3A = 3 sinA-4
3sinA-4sin³A= 3 sinA-4
-4sin³A= -4
sin³A= -4/-4
sin³A=1
[formula : sin 3A= 3sinA-4sin³A]
#666
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