Answer:
(m⁴-n⁴)
(m²+n²)(m²-n²)
(m²+n²)(m+n)(m-n)
3x +45°=180° (due to straight angle)
or, 3x= 180°-45°
or,3x= 135°
or,X=135°/3
X =45°.ans
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