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in Trigonometry by (79.1k points)
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if `(sectheta+tantheta)/(sectheta-tantheta)=2(51)/(79)` then the value of `sintheta` is
A. `(91)/(144)`
B. `(39)/(72)`
C. `(65)/(144)`
D. `(35)/(72)`

1 Answer

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Best answer
Correct Answer - c
Given, `(sectheta+tantheta)/(sectheta-tantheta)=2(51)/(79)`
`rArr(sectheta+tantheta)/(sectheta-tantheta)=(209)/(79)`
[by componendo-divideno `(a)/(b)=(c)/(d),(a+b)/(a-b)=(c+d)/(c-b)`]
`(sectheta+tantheta+sectheta-tantheta)/(sectheta+tantheta-sectheta+tantheta)=(209+79)/(209-79)`
`(2sectheta)/(2tantheta)=(288)/(130)`
`rArr((1)/(costheta))/(( sintheta)/(costheta))=(288)/(130)`
`rArr(1)/(sintheta)=(288)/(130)`
`rArr` Therefore, `sin theta=(130)/(288)`
`rArr sin theta=(65)/(144)`

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