Question

find the value of Sin8A​

Answer 1

Answer:

0.98935....

Step-by-step explanation:

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Answer 2

sin 8A= sin 2(4A)

=2sin 4A cos 4A

=2sin 2(2A) cos 2(2A)

=2 (2 sin 2A cos 2A)(cos^2 2A- sin^2 2A)

=2(2(2sinA cosA)cos2A)(cos^2 2A- sin^2 2A)