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Tentukan nilai dari

Pertanyaan

Tentukan nilai dari cos squared 30 degree minus sin squared 135 degree plus 8 sin 45 degree cos 135 degree equals...

Pembahasan Soal:

Mencari nilai sin135 dan cos135

table attributes columnalign right center left columnspacing 0px end attributes row cell sin 135 degree end cell equals cell sin open parentheses 180 minus 45 close parentheses end cell row blank equals cell sin 180 space cos 45 space minus space cos 180 space sin 45 end cell row blank equals cell open parentheses 0 cross times 1 half square root of 2 close parentheses minus open parentheses negative 1 cross times 1 half square root of 2 close parentheses end cell row blank equals cell 1 half square root of 2 end cell row cell cos 135 degree end cell equals cell cos open parentheses 180 minus 45 close parentheses end cell row blank equals cell cos 180 space cos 45 space plus space sin 180 space sin 45 end cell row blank equals cell open parentheses negative 1 cross times 1 half square root of 2 close parentheses plus open parentheses 0 cross times 1 half square root of 2 close parentheses end cell row blank equals cell negative 1 half square root of 2 end cell end table

Jadi hasil dari

table attributes columnalign right center left columnspacing 0px end attributes row cell cos squared 30 degree minus sin squared 135 degree plus 8 sin 45 degree cos 135 degree end cell equals cell open parentheses 1 half square root of 3 close parentheses squared minus open parentheses 1 half square root of 2 close parentheses squared plus 8 open parentheses 1 half square root of 2 close parentheses cross times open parentheses negative 1 half square root of 2 close parentheses end cell row blank equals cell 3 over 4 minus 1 half plus open parentheses negative 4 close parentheses end cell row blank equals cell fraction numerator negative 15 over denominator 4 end fraction end cell end table

Pembahasan terverifikasi oleh Roboguru

Terakhir diupdate 03 Juni 2021

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