Question

हल करें
(i) `cos6x+cos4x= sin 3x+sinx`
(ii) `cos5x+cos3x+cosx=0`
`(iii) cos theta-sin3 theta=cos2 theta`
`(iv) cos x+cos3x+cos5x+cos7x+0`
(v) `sin 3 theta+sin2 theta+ sin theta =0`
(vi) `sin 2x-sin4x+sin6x=0`

Answer 1

Correct Answer - `(i) (2n+1)(pi)/(2),(4n+1)(pi)/(14)(4n-1)(pi)/(6)n in I`
(ii) `(2n+1)(pi)/(6), n pi +-(pi)/(3), n in I " " (iii) (2npi)/(3),(4n+1)(pi)/(4),(4n-1)(pi)/(2)n in I`
(iv) ` (2n+1)(pi)/(6),(2n+1)(pi)/(4),(2n+1) pi`
(v) `(npi)/(2), 2n pi+-(2pi)/(3), n in I " " (vi) n=(n pi)/(4)` या `x=npi+-(pi)/(6), n in Z`