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Which expression is equivalent to cos(40°)cos(10°) + sin(40°)sin(10°)? sin(40° – 10°) cos(40° + 10°) sin(40° + 10°) cos(40° – 10°)

Which expression is equivalent to cos(40°)cos(10°) + sin(40°)sin(10°)? sin(40° – 10°) cos(40° + 10°) sin(40° + 10°) cos(40° – 10°)
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5 votes
Which expression is equivalent to cos(40°)cos(10°) + sin(40°)sin(10°)?

sin(40° – 10°)
cos(40° + 10°)
sin(40° + 10°)
cos(40° – 10°)

asked
User Patspam
by
7.9k points

1 Answer

3 votes

Answer:

its cos(40-10)

Explanation:

answered
User DeFrenZ
by
7.6k points
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