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plzz solve this
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Verified answer
AnsWer :
5.
QuestioN :
The exact value of expression
SolutioN :
Apply formula.
★ Taking One sides tan 9° , cot 9° and tan 27° , cot 27°.
★ Now, tan theta = Sin theta / cos theta.
★ tan 45° = 1.
★ Let Multiple by 2.
# Note :
°•° ( a - b )( a + b ) = a² - b² .