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Please answer this question I am waiting for your help thanks

Please answer this question I am waiting for your help thanks

Question Image
Grade:11

1 Answers

Arun
25763 Points
2 years ago
Dear Chandan
 
If we put x = 8pi /9
Sin ( 8 pi /9 + pi/3) = sin (11pi/9) = sin ( pi/2 + 13pi/18) = vos 13pi/18
Hence 
Cos^-1 ( cos 13pi/18) = 13pi/18
Hence
Answer should be e^(13pi/18)
If this is multiple correct question then similarly check for x = -7 pi/4
Other wise option B is correct

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