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= Cos (60+45) . Tan (60-45)
= (Cos 60 . cos 45 - sin 60 . sin 45) ()
= (1/2 .1/2 √2 - 1/2√3 .1/2√2) ()
= (1/4 √2 - 1/4 √6) ()
= 1/4 (√2-√6) ()
= 1/4 (√2-√6) ()
= 1/4 (√2-√6) ()
= 1()
= 2√6-4√2-2√8+4√6 / -8
= 6√6 - 4√2 - 2√(4.2) / -8
= 6√6 - 4√2 - 4√2 / -8
= 6√6 - 8√2 / -8
= -3/4 √6 + √2
Maaf, kalau salah..