Question

cos 36.cos54-sin36.sin54=0​

Answer 1

Answer:

Cos ( 90-54) cos 54 - sin ( 90-54) sin54

Cos ( 90-54) cos 54 - sin ( 90-54) sin54we know cos(90-threta) = sin threta

Cos ( 90-54) cos 54 - sin ( 90-54) sin54we know cos(90-threta) = sin thretasin 54 cos 54 - cos 54 sin 54

Cos ( 90-54) cos 54 - sin ( 90-54) sin54we know cos(90-threta) = sin thretasin 54 cos 54 - cos 54 sin 54=0

Hope it's help you.

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Answer 2

Answer:

$\huge\mathbb\red{hola dear}$

cos 36.cos54-sin36.sin54=0

given

cos36×(sin90-36)-Sin36×(cos90-36) = 0

then ,

cos 90 - Sin 90 = 0