1.

If 2 tanα2=tanβ2, prove that cos α=3+5cos β5+3 cos β. A.so, determine the value of cos α when β=60∘. Or If a sin θ=b sin(θ+2π3)=c sin(θ+4π3), find the value of ab + bc + ca.

Answer»

If 2 tanα2=tanβ2, prove that cos α=3+5cos β5+3 cos β. A.so, determine the value of cos α when β=60.

Or

If a sin θ=b sin(θ+2π3)=c sin(θ+4π3), find the value of ab + bc + ca.



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