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Trigonometrical Identities — Mathematics STD 10 — Question

ICSE BoardEnglish MediumSTD 10MathematicsTrigonometrical Identities1 Mark
Question
Prove that: tan (55° + x) = cot (35° - x)
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Answer

tan (55° + x) = tan [90° - (35° - x)] = cot(35° - x)

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