Question

If cos A=4/5 and sin =7/25 find cos (A+B)

Answer 1

Answer:

cos(A+B) = cosAcosB - sinAsinB

sinA = 3/5

cosA=4/5

cosB= 24/25

sinB = 7/25

cos(A+B)= (4/5)(24/25) - (3/5)(7/25)

= 96/125 - 21/125

= 75/125

= 3/5

Answer 2

Step-by-step explanation:

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