Write cos a in terms of tan A
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CosA=SinA/TanA.........
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tan²Φ
= sin²Φ
---------
cos²Φ
= cos²Φ-1
-------------
cos²Φ
tanΦ = under√cos²Φ -1/cos²Φ
= cosΦ-1/cosΦ
= sin²Φ
---------
cos²Φ
= cos²Φ-1
-------------
cos²Φ
tanΦ = under√cos²Φ -1/cos²Φ
= cosΦ-1/cosΦ
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