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Question
`(1 - tan^2 45^circ)/(1 + tan^2 45^circ)` = ?
Solution
`(1 - tan^2 45^circ)/(1 + tan^2 45^circ)` = `(1 - (1)^2)/(1 + (1)^2)` ......[∵ tan 45° = 1]
= `(1 - 1)/(1 + 1)`
= `0/2`
= 0
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Activity:
sec2θ = 1 + `square` ......[Fundamental trigonometric identity]
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