Question

value of sin2 18+cos2 18 ​

Answer 1

Step-by-step explanation:

sin²18 + cos²18 =?

sin²18 + sin²72 = sin²90.

sin²90 = 1.

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Answer 2

Answer:

sin^2 18° + cos^2 18° = 1

Step-by-step explanation:

By using the identity,

$sin^{2} + cos^{2} = 1 \\ sin^{2} 18 \: + cos^{2} 18 = 1$