Math, asked by jallibhanuprakash630, 4 months ago

prove that cos 2 degrees - sin 54 degrees = √5/4

Answers

Answered by ToxicVoid

0

Answer:

99987665555555....000....

Answered by sravanthiyerrabothu7

1

Answer:

cos²72 = cos²(90 - 18) = sin²18

sin²54 = sin²(90 - 36) = cos²36

Firstly find out the value of sin(18°) using the compound angle formulae as shown.

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