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Prove that tan10theta tan15theta tan75theta tan80theta=0

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Prove that tan10theta tan15theta tan75theta tan80theta=0

    • Posted by Anju Verma 7 years, 4 months ago

    CBSE > Class 10 > Mathematics
    • 1 answers

    Rahul Sha 7 years, 4 months ago

    Tan(90-80).tan(90-75).tan75.tan80 Cot80. Cot75. Tan75.tan80 1/tan80. 1/tan75. tan75.tan80 Cancel each. =0

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