![If cos A=sin2A. and a sin12A+b sin10A+c sin8A+sin6A=1. Then a+b+c=?](https://www.gkseries.com/blog/wp-content/uploads/2024/03/If-cos-Asin2A.-and-a-sin12Ab-sin10Ac-sin8Asin6A1.-Then-abc.jpg)
If cos A=sin2A. and a sin12A+b sin10A+c sin8A+sin6A=1. Then a+b+c=?
a) 5
b) 7
c) 6
d) 8
Sol:
![](https://www.gkseries.com/blog/wp-content/uploads/2024/03/image-145-703x1024.png)
If cos A=sin2A. and a sin12A+b sin10A+c sin8A+sin6A=1. Then a+b+c=?
a) 5
b) 7
c) 6
d) 8
Sol:
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