Find the general solution for each of t...

Find the general solution for each of the following equations :
(i) `cos4x=cos2x`
(ii) `cos3x=sin2x`
(iii) `sin3x+cos2x=0`
(iv) `sinmx+sinnx=0`

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(i) cos3x=cos2x (ii) cos5x=sin3x (iii) cosmx=sinnx