intregation of (tanx+cotx)²=
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( tanx + cotx ) ²
sin²x / cos²x + cos²x / sin²x
sin⁴x + cos⁴x / ( sin²x + cos²x ) ²
sin⁴x + cos⁴ x / ( 1 ) ²
Answer ➡ sin⁴x + cos⁴x
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