Answer is (b) 6. But I don't know how to solve it.Please solve ASAP. Tommorow I have an Exam.
Answer is (b) 6. But I don't know how to solve it.
Please solve ASAP. Tommorow I have an Exam.
Ushma , 7 Years ago
Grade 11
Trigonometry> Answer is (b) 6. But I don't know how to ...
1 Answers
Arun
Dear Ushma
sin^3 x = (3 sinx – sin3x) / 4
also
sin ax sinbx = ½ (cos(a – b)x – cos (a+b)x)
use the above identities
sin^3 x sin3x = (3 sinx – sin3x) * sin3x / 4
= 3/8 (cos 2x – cos 4x ) – 1/8 (cos 0x – cos 6x)
= 1/8 (cos 6x – 3 cos4x + 3 cos2x – cos 0x)
Hence n =6
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