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Rajan@2021
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Asked: 2021-04-17T10:45:37+05:30 In:

If cotB=3/5 and (A+B)=90°, find the value of sinA?

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An important and exam oriented question from trigonometry topic trigonometric identities in which we have given that cotB=3/5 and and we also have (A+B)=90°, we have to find  the value of sinA?

RS Aggarwal, Class 10, chapter 13C, question no 25

class 10rs aggarwaltrigonometric identities
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    1. Guru

      We have

      cos B = 3/5

      cos (90- A) = 3/5

      sin A = 3/5

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