Textbook Page 105
Remember This!
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cos (90 − θ) = sin θ
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sin (90 − θ) = cos θ
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\(\displaystyle \frac {\text{sin }\theta}{\text {cos }\theta} = \text{tan }\theta\)
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tan θ × tan (90 − θ) = 1
This page was last modified on
13 February 2026 at 15:05