Solution: The six trigonometric ratios are sine (sin), cosine (cos), tangent (tan), cotangent (cot), cosecant (cosec), and secant (sec)
4. sin2 30∘ + sin2 45∘ + sin2 60∘ + sin2 90∘
4. sin2 30∘ + sin2 45∘ + sin2 60∘ + sin2 90∘
Solution: The six trigonometric ratios are sine (sin), cosine (cos), tangent (tan), cotangent (cot), cosecant (cosec), and secant (sec)