Please help with these three questions and 4 abc

AR Exit Fullscreen 4. State the primary trig ratios and the reciprocal trig ratios for the following angle: MCR 3U - Grade 11 University Exam Review 9 of 15 P ( - 2, 5) Ty 5. Prove the following trigonometric identity is true and state the names of the identities used to prove it: sin O + 2cos20 - 1 = cos30 6. To estimate the amount of usable lumber in a tree, Chitra must first estimate the height of the tree. From points A and B on the ground, she determined that the angles of elevation for a certain tree were 410 and 520, respectively. The angle formed at the base of the tree between points A and B is 90 and A and B are 30 m apart. If the tree is perpendicular to the ground, what is its height to the nearest metre? 352....png energies-11-0352....png Humphrey-and-Br...png 1581655448.pngMK 12/15ullscreen Unit 6 Exam Review - Sinusoidal Functions (Continued) 4. Jordan is sitting in a rocking chair. The distance d (t ), between the wall and the rear of the chair varies sinusoidally with time t. At t=1 s, the chair is closest to the wall and d (1)=1.5m. At t=2, the chair is farthest from the wall and d (2) = 3.2m. a) What is the period of this function? What does it represent in this situation? b) What is the amplitude of this function? What does it represent in this situation? c) What is the equation of this sinusoidal function? d) Sketch the function for O sSt $20 s. Distance (m) energies-17-0352 ping Humphrey-and-Br. png 1581655448.png