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Cos(70° )cos(20° )+sin(70° )sin(20° )=cos(___°)?
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Cos(70° )cos(20° )+sin(70° )sin(20° )=cos(___°)?

Cos(70° )cos(20° )+sin(70° )sin(20° )=cos(___°)?-example-1
User Bpgeck
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1 Answer

2 votes

Answer:

Explanation:

Sum and Difference Formula

cos( U +/- V ) = cosU*cosV -/+ sinU*sinV

cos( U - V ) = cos(70)cos(20) + sin(70)sin(20)

cos( U - V ) = cos (70 - 20)

cos( 50 ) = .642788

User RedCrayon
by
4.8k points
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