[tan³Φ/1+tan²Φ]+
[cot³Φ/1+cot²Φ]=
secΦ×cosecΦ-2sinΦcosΦ
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Answer:
tan³Φ/1+tan²Φ]+
[cot³Φ/1+cot²Φ]=
secΦ×cosecΦ-tan³Φ/1+tan²Φ]+
[cot³Φ/1+cot²Φ]=
secΦ×cosecΦ-2sinΦcosΦ
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