sin (75)² + sin (15)² + sin (35)²
= sin (90 - 15)² + sin (15)² + sin (35)²
= [cos (15)² + sin (15)²] + sin (35)²
= 1 + sin (35)²
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sin (75)² + sin (15)² + sin (35)²
= sin (90 - 15)² + sin (15)² + sin (35)²
= [cos (15)² + sin (15)²] + sin (35)²
= 1 + sin (35)²