Question

que- prove that cos(81°+∅) = sin(9°-∅) please answer me i mark him as a branliest and give 5 stars rating with easy explanation

Answer 1

Answer:

LHS,

cos( 81 + ∅)

= cos( 90 - 9 + ∅)

= cos{90 -( 9 -∅) }

= sin(9 - ∅)

Step-by-step explanation:

formula used :

cos( 90 - A) = sinA

here , A = 9 -∅

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