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CBSE Class 12-science Answered

1. space space space F i n d space theta element of open square brackets table row cell 0 space comma end cell cell pi over 2 end cell end table close square brackets space r e p r e s e n t i n g space t h e space s o l u t i o n space o f space space space space space space space space space space space open vertical bar table row cell 1 plus cos squared theta end cell cell sin squared theta end cell cell 4 sin 4 theta end cell row cell cos squared theta end cell cell 1 plus sin squared theta end cell cell 4 sin 4 theta end cell row cell cos squared theta end cell cell sin squared theta end cell cell 1 plus 4 sin 4 theta end cell end table close vertical bar equals 0 2. space space space i f space a comma b comma c space a r e space s u c h space t h a t space a plus b plus c equals 0 p r o v e space t h a t open vertical bar table row 1 cell cos c end cell cell cos b end cell row cell cos c end cell 1 cell cos a end cell row cell cos b end cell cell cos a end cell 1 end table close vertical bar
Asked by Eng.surinder.singh | 25 Jan, 2019, 01:06: PM
answered-by-expert Expert Answer
only one question is answered per posting. First question is answered
 
After expanding the determinant, the resulting expression is simplified to get solution for θ as given below
 
Answered by Thiyagarajan K | 26 Jan, 2019, 03:11: PM

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