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यदि `sin3Acos(A-26^(@))` है जहाँ 3A एक न्यूनकोण है तो A का मान ज्ञात करे

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यदि `sin3Acos(A-26^(@))` है जहाँ 3A एक न्यूनकोण है तो A का मान ज्ञात करे
A. `29^(@)`
B. `26^(@)`
C. `23^(@)`
D. `28^(@)`
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Correct Answer - a
`sin3A=cos(A-90^(@))`
`4A=116^(@)`
`A=29^(@)`
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