cos3tita = cos²tita then the general solution is
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HEY MATE....
here is ur ans...
3θ=2nπ±2θ[⋅.⋅n∈1]
3θ=2nπ+2θ
3θ−2θ=2nπ
θ=2nπ
or3θ+2θ=2nπ
5θ=2nπ
θ=
5
2
nπ
HOPE MY EFFORTS SATISFIED UH....
HOPE IT HELPS❤
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