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Question
Choose the correct alternative:
If tan 40° = λ, then `(tan 140^circ - tan 130^circ)/(1 + tan 140^circ * tan 130^circ)` =
Options
`(1 - lambda^2)/lambda`
`(1 + lambda^2)/lambda`
`(1 + lambda^2)/(2lambda)`
`(1 - lambda^2)/(2lambda)`
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Solution
`(1 - lambda^2)/(2lambda)`
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