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If sinA=(3)/(5)"where "450^(@)ltAlt540^(@),then "cos"(A)/(2) is equal to |
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Answer» `(1)/(sqrt(10))` `rArr225^(@)lt(A)/(2)lt270^(@)` `COSA=(-4)/(5)(because A" LIES in Q 2")` ![]() `therefore"cos"^(2)(A)/(2)=(1+cosA)/(2)=(1)/(10)` `RARR"cos"(A)/(2)=(-1)/(sqrt(10))(because(A)/(2)" lies in Q 3")` |
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