plzz answer this question..
marking.....As ...
BRAINLIST....
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Answered by
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Hey mate here is your answer
sin B = 1/2
sin B = sin 30
Therefore ,
B = 30 -----( 1 )
according to the problem given,
LHS = 3(cos B ) - 4 Cos³ B
= - ( 4cos³ B - 3 cos B )
[ since cos 3x = 4cos³ x - 3 cos x ]
= - cos 3B
= - cos ( 3 × 30) from ( 1 )
= - cos 90
= 0
= RHS
Hope it helped you
zeeshanjunaid2k17:
Thank you so much for marking it as brainlist
It means a lot
:)
;-)
Answered by
1
Answer:
Step-by-step explanation:
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