Tan A = 12/5
sisi miring = √12² + 5² = 13
SIN A = 12/13
COS A = 5/13
COS B = 8/10
SISI DEPAN = √100 - 64 = 6
SIN B = 6/10
COS (A+B)
COS A. COS B - SIN A . SIN B
5/13 x 8/10 - (12/13 x 6/10
= 40/130 - ( 72/130
= - 32/130
= - 16/65
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Tan A = 12/5
sisi miring = √12² + 5² = 13
SIN A = 12/13
COS A = 5/13
COS B = 8/10
SISI DEPAN = √100 - 64 = 6
SIN B = 6/10
COS (A+B)
COS A. COS B - SIN A . SIN B
5/13 x 8/10 - (12/13 x 6/10
= 40/130 - ( 72/130
= - 32/130
= - 16/65