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If sin theta=1/2 show that 3 …

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If sin theta=1/2 show that 3 cos theta-4cos cube theta=0

    • Posted by Diya Parmar 5 years, 10 months ago

    CBSE > Class 10 > Mathematics
    • 1 answers

    Aadya Singh 5 years, 10 months ago

    Sin theta = 1/2
    => Sin theta = sin 30
    => theta = 30 ..
    3 × cos 30 - 4× cos cube 30
    => 3× (√3/2) - 4(√3/2) 3
    => 3√3/2 - 4 × 3√3/8
    => 3√3/2 - 3√3/2 => 0
    Now, RHS = LHS...So, it's prove..

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