Math, asked by sutongvishalldeo, 5 days ago

evaluate cos²42⁰ - sin²48⁰

Answers

Answered by muhammadfaizeens

1

cos²42⁰ - sin²48⁰= cos²(90-48) - sin²48⁰

=sin²48⁰-sin²48⁰=0

(cos(90-x)=sinx)

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