Jawab:
C. 0
Penjelasan dengan langkah-langkah:
f(x) = sin^2(9x) + cos^2(9x) - tan^2(9x)f(45) = [sin ^2(9x) + cos^2(9x)] - tan^2(9x)
sin^2 x + cos^2 x = 1
f(45) = 1 - tan^2 (9·45) = 1 - tan ^2 (405) = 1 - tan^2 (405 - 360) = 1 - tan^2 (45)
tan 45 adalah 11 - 1 = 0
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Jawab:
C. 0
Penjelasan dengan langkah-langkah:
f(x) = sin^2(9x) + cos^2(9x) - tan^2(9x)
f(45) = [sin ^2(9x) + cos^2(9x)] - tan^2(9x)
sin^2 x + cos^2 x = 1
f(45) = 1 - tan^2 (9·45)
= 1 - tan ^2 (405)
= 1 - tan^2 (405 - 360)
= 1 - tan^2 (45)
tan 45 adalah 1
1 - 1 = 0