Question

Sin 20 degree is equal to cos?

Answer 1

cos 70.. use the formula COS90-O

Answer 2

$Sin \: 20\degree \\ = sin ( 90 - 70 ) \\= cos \: 70 \degree$

$We \:know \:that , \\\blue { (By \: complementary \:angles \: Property )}\\\boxed { \pink { sin ( 90 \degree - A ) = cos \: A }}$

Therefore.,

$\red { Sin \: 20\degree} \green {= cos \: 70 \degree }$

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