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find the value of cos( 480) …

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find the value of cos( 480) & sin(-1125)

    • Posted by Arpit Kumar 6 years ago

    CBSE > Class 11 > Mathematics
    • 1 answers

    Soumyadeep Paul 6 years ago

    cos(480) can also be written as cos(2π+2π/3) , now we know that, value of cos(2π) is 0, so now we get cos(2π/3) that is , cos(π/2 + π/6) , that is cos(90+30), which is -sin(30) and its value is -1/2. And it should be -sin(1125). It can also be written as -sin(6π + π/4), and value of 6π is 0. So we get -sin(π/4) and it is -sin(45) and its value is -1/√2

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