Soal dan Pembahasan
Soal Try Out Matematika IPA
Soal Ujian Nasional SMA
UN Matematika IPA
24. lim x → π/2sin (x - π/4) - 1/2√2
------------------------
cos (x - π/4) - 1/2√2
sama dengan ...
a. - 3
b. - 2
c. - 1
d. 1
e. 2
Jawaban : C
menggunakan turunan,
= lim x → π/2
sin (x - π/4) - 1/2√2
------------------------
cos (x - π/4) - 1/2√2
diturunkan,
= lim x → π/2
cos (x - π/4)
-----------------
- sin (x - π/4)
masukkan nilai x = π/2
cos (π/2 - π/4)
= -----------------
- sin (π/2 - π/4)
cos (π/4)
= -----------
- sin (π/4)
= 1/2 / - 1/2
= - 1
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