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Jelillia J
Jelillia J asked in Science & MathematicsMathematics · 10 years ago

0=2cosx-cosx tried identities, can't solve ?

it's confusing. i've tried a bunch of trig rules and identities and still nothing. help?

1 Answer

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  • Anonymous
    10 years ago
    Favorite Answer

    2cosx-cosx=0

    take cosx common so,

    cosx=0

    now we can write o=cos(pie/2) pie =180

    so we get

    cosx=cos(90)

    x=pie/2

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