Question

the value of cos 70 cos 10 + sin70 sin 10​

Answer 1

Answer:

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Step-by-step explanation:

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Answer 2

Answer:

1

ankushkumar539

ankushkumar539

05.12.2018

Math

Secondary School

+5 pts

Answered

Show that Cos70°. Cos10°+ Sin70°. Sin10° =1/2

2

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Answers

Kalpeshprabhakar Genius

Answer:

Cos 70 . Cos 10 + Sin 70 . Sin 10 = 1/2

LHS:-

This is of the form: Cos A.Cos B + Sin A.Sin B, which is actually Cos ( A-B ).

Here, A = 70, B = 10

Hence we can write it as:

⇒ Cos ( 70 - 10 )

⇒ Cos 60

Cos 60 is actually 1/2.

Hence LHS = RHS

Hence Proved !!