"The number of distinct real roots of `|[sinx,cosx,cosx],[cosx,sinx,cosx],[cosx,cosx,sinx]|=0`  in
Channel: Doubtnut
Date: 2020-06-28

"The number of distinct real roots of `|[sinx,cosx,cosx],[cosx,sinx,cosx],[cosx,cosx,sinx]|=0`
 
 in the interval `pi//4lt=xlt=pi//4`
 
 is
 
 `0`
 
 b. `2`
 
 c. `1`
 
 d. `3`"