Sina-cotA /2 tan A=
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SinA - cosA/sinA
______________
sinA/cosA
= sin²A - cosA
___________
SinA
_______________
sinA/cosA
=. Sin²A - cosA
___________. × sinA
SinA
_______________
CosA
=. Sin²A - cosA
____________
CosA
= Sin²A
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