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sinA=sinB p
cosA=cosB q
tanA=sinA / cosA=sinB p /cosB q=tanB p/q
sinB =sinA /p
cosB =cosA /q
tanB =(sinA/p) / (cosA /q)
=(sinA /p) ×(q/cosA)
=tanA q/p
cosA=cosB q
tanA=sinA / cosA=sinB p /cosB q=tanB p/q
sinB =sinA /p
cosB =cosA /q
tanB =(sinA/p) / (cosA /q)
=(sinA /p) ×(q/cosA)
=tanA q/p
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