Let A = 30°, Verify that
sin2A = (2tanA) / ( 1 + tan^2A) ;
cos2A = ( 1 - tan^2A ) / ( 1 + tan^A ).
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Given
A = 30°
Sin²A = ( 2 tan A ) / ( 1 + tan²2A )
2 . tan 30° / 1 + tan²30°
2 . 1/√3 / 1 + (1/√3)²
2/√3 / 1 + (1/3 )
2/√3 / 3+1/3
2/√3 / 4/3
2/√3 × 3/4
3 / 2√3
Cos²A = ( 1 - tan²A ) / ( 1 + tan A )
1 - tan²30° / 1 + tan 30°
1 - (1/√3)² / 1 + 1/√3
1 - 1/3 / 1 + 1/√3
3 - 1 / 3 / 1 / √3
2/3 / 1/√3
2/3 × √3/1
2√3 / 3
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