Tan4x cotx = 0
2sin 2x + 2 cos 2x = 6
sin4x sinx - cos4x cosx =0
\\
tan4x- cotx =0
tan4x - cotx = 0
tan4x = cotx
tan4x = tan (90 -x)
4x = 90 -x
5x=90
x = 18
: 1 (0 1 )
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