Math, asked by Noni1383, 1 year ago

Cos 15 .cos75 - sin 75 . sin 15

Answers

Answered by mysticd

1

Solution:

_____________________

We know that ,

cosA cosB-sinAsinB

= cos(A+B)

_____________________

Here,

A = 15, B = 75

Now,

Cos 15 .cos75 - sin 75 . sin 15

= cos(15+75)

=cos90°

= 1

•••

Answered by nalinsingh

1

Answer:

Step-by-step explanation:

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