Sin theta=8/17
, tan alfa=15/8
, then find cos(theta+alfa) = ?
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Step-by-step explanation:
SinO = 8/17
CosO = √1 - Sin²O
= √1 - (64/289)
= √225/289 = 15/17
tan alpha = 15/8 = लम्ब /आधार
कर्ण = √(8)² + (15)²
= √64+225 = √289 = 17
Sin alpha = L/K = 15/17
Cos alpha = A/K = 8/17
Now ,
Cos( O + alpha )
CosO*Cos alpha - SinO*Sin alpha
(15/17)(8/17) - (8/17)(15/17)
120/289 - 120/289
= 0
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