Evaluate Sum of Squares of Trigonometric series sin1 + sin 5 + sin 9 + sin 89

All Formula for Compound Angles:
Trigonometric Series for product of sine ratios
Q3. Solve for A: sin^2⁡A 〖〖+ sin〗^2 2A〗⁡〖=1〗
Q4. Evaluate: 〖sin^2⁡〖1°〗 〖+sin^2〗⁡〖5°〗 〖+sin〗^2⁡〖9°〗+⋯+sin^2⁡〖89° 〗〗^⁡

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