CotA - CosA / cotA + CosA = cosecA - 1 / cosecA + 1
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cotA-cosA) /(cotA+cosA)
=(cosA/sinA-cosA) /(cosA/sinA +cosA)
=(cosA-cosAsinA) /(cosA+cosA sinA)
=cosA(1-sinA)/cosA(1+sinA)
=(1-sinA) /(1+sinA)
=(1–1/cosecA)/(1+1/cosecA)
=(cosecA-1)/(cosecA+1)
=(cosA/sinA-cosA) /(cosA/sinA +cosA)
=(cosA-cosAsinA) /(cosA+cosA sinA)
=cosA(1-sinA)/cosA(1+sinA)
=(1-sinA) /(1+sinA)
=(1–1/cosecA)/(1+1/cosecA)
=(cosecA-1)/(cosecA+1)
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