2 cos (Π/2+x)cos (Π/2-x)
Matematika
ivafadhilatull
Pertanyaan
2 cos (Π/2+x)cos (Π/2-x)
1 Jawaban
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1. Jawaban Pelajarmandiri
2 . cos(π/2 +x) . cos(π/2 -x)
= 2 . cos(90+x) . cos(90-x)
= 2 . (-sinx) . sinx
= -2 sin²x