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Question

Prove that 2tan112tan117=π4
Prove that 3sin1x=sin1(3x4x3),xϵ[12,12]

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Solution

1)2tan112tan117=π4

LHS :
2tan112tan117

=tan143tan117 [2tan1x=tan12x1x2]

=tan12525 [tan1xtan1y=tan1xy1+xy]

=tan11

=π4 = RHS

2)3sin1x=sin1(3x4x3)
RHS :
sin1(3x4x3)
Let x=sinθ
=sin1(3sinθ4sin3θ)
=sin1sin3θ
=3θ
=3sin1x = LHS


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