how can 2 by cosA become 2secA
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because in a right angle triangle
CosA=adjacent side to angle A /hypotenuse
And
SecA= hypotenuse /adjacent side to angle A
therefore cos A =1/secA
CosA=adjacent side to angle A /hypotenuse
And
SecA= hypotenuse /adjacent side to angle A
therefore cos A =1/secA
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