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Sin a = 3/5 Dan Tan b = 12/5, Nilai cos (a + b) = ....

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 JAWABAN: D

PEMBAHASAN:

sin a = 3/5, cos a = 4/5

tan b =12/5, sin b = 12/13, cos b = 5/13

cos (a + b) = cos a cos b – sin a sin b

cos (a + b) = 4/5 . 5/13 – 3/5 . 12/13

cos (a + b) = 4/13 – 36/65

cos (a + b) = 20/13 – 36/65

cos (a + b) = -16/65

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