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Tan²A -cot²A = sec²A(1-cot²).Trigonometic Identity​
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Tan²A -cot²A = sec²A(1-cot²).Trigonometic Identity​

User Ptrn
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your proving is in photo

Tan²A -cot²A = sec²A(1-cot²).Trigonometic Identity​-example-1
User Michael Jarvis
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