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Evaluate sin 105°+cos 105°

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Evaluate sin 105°+cos 105°

    • Posted by Ayush Pathak 7 years, 4 months ago

    CBSE > Class 11 > Mathematics
    • 2 answers

    Naved Khan 7 years, 4 months ago

    Sin 150=sin(45+60) Sin (a+b)=sin a cos b+cos a sin b =sin45×cos60+cos45×sin60 =(1/root2×1/2)+(1/root2×root3/2) =1/2root2+root3/2root2 =1+root3/2root2

    2Thank You

    Xyz Abc 7 years, 4 months ago

    Write 105° as (45+60)° and then use the formula sin(a+b) and cos(a+b)

    0Thank You

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