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If A is an acute angle and cotaA+co s ecA=3, then the value of (यदि A एक न्यूनकोण है तो और cotaA+co s ecA=3 का मान है )

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If A is an acute angle and cotaA+co s ecA=3, then the value of (यदि A एक न्यूनकोण है तो और cotaA+co s ecA=3 का मान है )
A. 1
B. `4/5`
C. `3/5`
D. 0
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Correct Answer - c
According to the question.
`co s ec+cosA=3`
`(co s ecA-cotA)/(2co s ecA)=(1)/(3) =(10)/(3)`
`co s ecA=(10)/(6)`
`sinA=(6)/(10)=(3)/(5)`
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