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Nilai dari

Nilai dari begin mathsize 14px style fraction numerator sin space 70 degree space s e c space 140 degree times tan space 50 degree over denominator cos space 20 degree times s e c space 40 degree times tan space 130 degree end fraction equals... end style 

  1. begin mathsize 14px style negative 1 end style 

  2. begin mathsize 14px style 0 end style

  3. begin mathsize 14px style 1 end style  

  4. begin mathsize 14px style T a n space 20 degree end style

  5. begin mathsize 14px style S e c space 20 degree end style 

Jawaban:

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell fraction numerator sin space 70 degree space s e c space 140 degree times tan space 50 degree over denominator cos space 20 degree times s e c space 40 degree times tan space 130 degree end fraction end cell equals cell fraction numerator sin space 70 degree open parentheses begin display style fraction numerator 1 over denominator cos space 140 degree end fraction end style close parentheses space tan space 50 degree over denominator cos space 20 degree open parentheses begin display style fraction numerator 1 over denominator cos space 40 degree end fraction end style close parentheses space tan space 130 degree end fraction end cell row blank equals cell fraction numerator sin space 70 degree times tan space 50 degree times cos space 40 degree over denominator cos space 20 degree times cos space 140 degree times tan space 130 degree end fraction end cell row blank equals cell fraction numerator sin space left parenthesis 90 minus 20 right parenthesis degree times tan space 50 degree times cos space 40 degree over denominator cos space 20 degree times cos space left parenthesis 180 minus 40 right parenthesis degree times tan space left parenthesis 180 minus 50 right parenthesis degree end fraction end cell row blank equals cell fraction numerator up diagonal strike cos space 20 degree end strike times up diagonal strike tan space 50 degree end strike times up diagonal strike cos space 40 degree end strike over denominator up diagonal strike cos space 20 degree end strike times up diagonal strike negative cos space 40 degree end strike times negative up diagonal strike tan space 50 degree end strike end fraction end cell row blank equals 1 end table end style

Jadi, jawaban yang tepat adalah C.

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