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Question
If sin 30° = x and cos 60° = y, then x2 + y2 is
Options
`1/2`
0
sin 90°
cos 90°
Solution
`1/2`
Explanation;
Hint:
sin 30° = x = `1/2`
cos 60° = y = `1/2`
x2 + y2 = `(1/2)^2 + (1/2)^2`
= `(1/4) + (1/4)`
= `(2/4)`
= `1/2`
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