If sinA + sin2A=1 and a cos12A + b cos8 A + c cos6 A - 1= 0 then prove that b + c/a + b = 3
If sinA + sin2A=1 and a cos12A + b cos8 A + c cos6 A - 1= 0 then prove that b + c/a + b = 3
Ramkishor Joshi , 6 Years ago
Grade 12th pass
Trigonometry> If sinA + sin 2 A=1 and a cos 12 A + b co...
1 Answers
Arun
Last Activity: 6 Years ago
sin@+sin^2@=1
=>sin@=1-sin^2@=cos^2@
Now we know
cos^12@+3cos^10@+3cos^8@+cos^6@-1 = 0
Hence
Now find a, b, c, d and then find answer.
Regards
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