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If sin30^(@)=x " and " cos60^(@)=y, " th...

If `sin30^(@)=x " and " cos60^(@)=y, " then " x^(2)+y^(2)` is

A

`1/2`

B

0

C

`sin90^(@)`

D

`cos90^(@)`

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Knowledge Check

  • If sin 30 ^(@) = x and cos 60 ^(@)= y, then x ^(2) + y ^(2) is

    A
    `1/2`
    B
    0
    C
    `sin 90^(@)`
    D
    `cos 90^(@)`

  • If x = a sin theta and y= b cos theta " then " ( d^(2) y)/( dx^(2)) is

    A
    ` (a)/( b^(2)) sec^(2) theta`
    B
    ` - ( b)/( a) sec ^(2) theta`
    C
    ` - ( b)/(a^(2) sec ^(3) theta `
    D
    ` - ( b^(2) ) / (a ^(2)) sec ^(3) theta `

  • If x= a sin theta and y =b cos theta, then (d^2 y)/(dx^2) is…............ .

    A
    `(a)/(b^2) sec^(2) theta`
    B
    `- (b)/(a) sec^(2) theta`
    C
    `- (b)/(a^2) sec^(3) theta`
    D
    `- (b^2)/(a^2) sec^(3) theta`

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