Question

evaluate the following 1)cos square 72-sin square 54

Answer 1

Answer:

HELLO DEAR,

cos²72 = cos²(90 - 18) = sin²18 = (√5 - 1)/4

sin²54 = sin²(90 - 36) = cos²36 = (√5 + 1)/4

now, cos²72 - sin²54











I HOPE IT'S HELP YOU DEAR,

THANKS

Answer 2

Answer:

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