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Find tan 18^@...

Find `tan 18^@`

Text Solution

Verified by Experts

Here, `x = 18^@`
`:. 5x = 90^@`
`=> 2x = 90^@-3x`
`=>sin 2x = sin (90^@-3x)`
`=>sin2x = cos3x`
`=>2sinxcosx = 4cos^3x-3cosx`
`=>2sinx = 4cos^2x -3`
`=>2sinx = 4(1-sin^2x) -3`
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