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If sectheta-tantheta=(1)/(sqrt(3)), the ...

If `sectheta-tantheta=(1)/(sqrt(3))`, the value of `sectheta.tantheta` का मान है

A

`(4)/(sqrt(3))`

B

`(2)/(sqrt(3))`

C

`(2)/(3)`

D

`(1)/(sqrt(3))`

लिखित उत्तर

Verified by Experts

The correct Answer is:
c

Shortcut method
Put `theta=30^(@)`
`sectheta-tantheta=(1)/sqrt(3)`
`sec30^(@)-tan30^(@)=(1)/sqrt(3)`
`(2)/sqrt(3)-(1)/sqrt(3)=(1)/sqrt(3)`
`(1)/sqrt(3)=(1)/sqrt(3)` (satisfied)
`sectheta=30^(@)`
`rArrsectheta.tantheta`
`rArr sec30^(@).tan30^(@)`
` rArr(2)/sqrt(3)xx(1)/sqrt(3)=(2)/(3)`
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