1.

यदि `sin theta =(4)/(5)`, तो निम्नलिखित के मान ज्ञात कीजिए । `sin 2 theta` यहाँ `theta` एक न्यूनकोण है ।

Answer» दिया है - `" "sin theta = (4)/(5)`
इसलिए `" "cos theta=sqrt(1-sin^(2)theta)=sqrt(1-((4)/(5))^(2))=sqrt(1-(16)/(25))=(3)/(5)`
और `" "tan theta =(sin theta)/(cos theta)=(4//5)/(3//5)=(4)/(3)`
`sin 2 theta =(sin theta)/(cos theta)=(4//5)/(3//5)=(4)/(3)`
`=2xx(4)/(5)xx(3)/(5)=(24)/(25)`


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