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Nilai dari sin 28 5 O adalah...

Nilai dari  adalah...

  1. begin mathsize 14px style 1 fourth left parenthesis square root of 6 plus square root of 2 right parenthesis end style

  2. begin mathsize 14px style negative 1 fourth left parenthesis square root of 6 plus square root of 2 right parenthesis end style

  3. begin mathsize 14px style 1 half left parenthesis square root of 6 plus square root of 2 right parenthesis end style

  4. begin mathsize 14px style negative 1 fourth left parenthesis square root of 6 minus square root of 2 right parenthesis end style

  5. begin mathsize 14px style 1 fourth left parenthesis square root of 6 minus square root of 2 right parenthesis end style

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begin mathsize 14px style sin space 285 to the power of straight O equals sin space open parentheses 240 to the power of straight o plus 45 to the power of straight o close parentheses space space space space space space space space space space space space space space space equals sin space 240 to the power of straight o. cos space 45 to the power of straight o plus cos space 240 to the power of straight o. sin space 45 to the power of straight o space space space space space space space space space space space space space space space equals left parenthesis negative sin space 60 to the power of straight o right parenthesis. cos space 45 to the power of straight o plus left parenthesis negative cos space 60 to the power of straight o right parenthesis. sin space 45 to the power of straight o space space space space space space space space space space space space space space space equals open parentheses negative 1 half square root of 3 close parentheses. open parentheses 1 half square root of 2 close parentheses plus open parentheses negative 1 half close parentheses open parentheses 1 half square root of 2 close parentheses space space space space space space space space space space space space space space space equals negative 1 fourth space square root of 6 minus 1 fourth space square root of 2 space space space space space space space space space space space space space space space space equals negative 1 fourth open parentheses square root of 6 plus square root of 2 close parentheses     end style

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Jika diketahui cos(30 o + x) = 13 5 ​ ,maka nilai dari cos(75 o + x)adalah ....

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