find the value of cosec 70 - sec 20
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Firstly,we know that
Sin(90-A) = CosA
hence
Sin70= Sin(90-20)= Cos 20
1.)cosec70= 1/Sin70= 1/Cos20 ( as proven above)
2.)sec20= 1/cos20
Subtracting equation 1 & 2
= (1/Cos 20 )-(1/Cos20)
=0
Sin(90-A) = CosA
hence
Sin70= Sin(90-20)= Cos 20
1.)cosec70= 1/Sin70= 1/Cos20 ( as proven above)
2.)sec20= 1/cos20
Subtracting equation 1 & 2
= (1/Cos 20 )-(1/Cos20)
=0
sasr2210:
yes??
all fine
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