InterviewSolution
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InterviewSolution
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`sin^(2)5^(@)+sin^(2)10^(@)+sin^(2)15^(@)+ . . . .+sin^(2)85^(@)+sin^(2)90^(@)` is equal toA. `7(1)/(2)`B. `8(1)/(2)`C. `9`D. `9(1)/(2)` |
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Answer» Correct Answer - d `(sin^(2)5^(@)+sin^(2)10^(@)+..........+sin^(2)85^(@))+sin^(2)90^(@)` No. of term`={((85-5)/(5))+1}+1` `=(17)/(2)+1` sum of seris `=9(1)/(2)` [use this approach in eaxm] |
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