(cos α tan α)²+(sin α cot α)²-sin²α

[tex](cos \alpha . \frac{sin \alpha }{cos \alpha })^{2} + (sin \alpha . \frac{cos \alpha }{sin \alpha })^{2}-sin ^{2} \alpha = sin ^{2} \alpha + cos ^{2} \alpha - sin ^{2} \alpha = cos ^{2} \alpha [/tex]

Jawabannya cos²α

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