I'm asked to prove $\tan \theta=\cot (90-\theta)$ So $\tan \theta =\frac{a}{b}=\cot(90^\circ-\theta)$ But what if $\theta>90?$
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SOLUTION: Algebra and trigonometry first secondary(math) - Studypool
Trigonometry Formulas and Identities - List of All Trigonometric
10.3: The Six Circular Functions and Fundamental Identities
Mathematical Prerequisites for Software Engineers
Why tan(90-θ)=cotθ
10.3: The Six Circular Functions and Fundamental Identities
33 Prove that ( frac { cot ( 90 - theta ) } { tan theta } + frac