Math, asked by 1lovesandhu2, 1 year ago

cos510.cos330+sin390 .cos120=-1

Answers

Answered by Anonymous

see the image and Mark as brainliest

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1lovesandhu2: how 1/2 come

Anonymous: sin (360 + 30) = sin 30 = 1/2

1lovesandhu2: Thanx

1lovesandhu2: okk

Anonymous: ok sir. i will write

Anonymous: why like that

Answered by InvincibleBoy

Hey User .✋

Answer Of Your Question☺️
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cos510.cos330+sin390.cos120=-1

LHS,

cos510.cos330+sin390.cos120

→cos(90 × 5 + 60).cos(90 * 3 + 60) +sin(90×4+30).cos (90×1+30)

Finally,

→ -3/4 + (-1/4)

→ -1

RHS,

=-1 [Proved]

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Hope My Answer Helped☺️☺️☺️☺️☺️
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1lovesandhu2: yeah , it's helped a lot , thanx

1lovesandhu2: i just marked

1lovesandhu2: why

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