Question

evaluate 1, sin18⁰,cos72⁰







​

Answer 1

Answer:

sin θ - 4 (1 - sin^2 A) + 3 = 0. ⇒ 4 sin^2 A + 2 sin A - 1 = 0, which is a quadratic in sin A. Therefore, sin θ = −2±√−4(4)(−1)2(4). ⇒ sin θ ...

Answer 2

90⁰ also dibo high sign Tricia