Math, asked by harinisuryam130, 6 months ago

2. The value of sin 21º + cos 85° + cos 155° is

Answers

Answered by shravanim0220

1

Answer:

geometry is so hard to answer

Answered by manishaverma8182

2

Answer:

Cos35 +cos85+cos 155

Cos(60-25)+cos(60+25)+cos155

2 cos60 cos 25 + cos (180-25)

2*1/2 cos25 - cos 25

Cos 25 - cos25=0

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