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trig identities (inc. sec, cosec and cot)
prove that:
cosec(A+B) = (secAsecB) / (tanA+tanB)
you need to use the identies,
sin(A+B)=sinAcosB+sinBcosA etc?
cosec(A+B) = (secAsecB) / (tanA+tanB)
you need to use the identies,
sin(A+B)=sinAcosB+sinBcosA etc?
Reply 1
10
don't worry! i worked it out 
Reply 2
15
shewantstobeme
prove that:
cosec(A+B) = (secAsecB) / (tanA+tanB)
you need to use the identies,
sin(A+B)=sinAcosB+sinBcosA etc?
cosec(A+B) = (secAsecB) / (tanA+tanB)
you need to use the identies,
sin(A+B)=sinAcosB+sinBcosA etc?
LHS = 1/(sin(A+B)
= 1/(sinAcosB + sinBcosA)
Now divide numerator and denominator by cosAcosB to give RHS
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