buktikan 4 - sin a/ sin a sec a =4 cot a - cos a
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buktikan
4 - sin a/ sin a sec a =4 cot a - cos a
4 - sin a/ sin a sec a =4 cot a - cos a
1 Jawaban
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1. Jawaban Robinn
4cotx - cosx = 4 - sinx / sinx . secx
4cotx - cosx = 4 - sinx / sinx (1/cosx)
4cotx - cosx = 4 - sinx / sinx/cosx
4cotx - cosx = cosx (4 - sinx) / sinx
4cotx - cosx = 4cosx - sinxcosx / sinx
4cotx - cosx = 4cosx/sinx - sinxcosx/sinx
4cotx - cosx = 4cotx - cosx