≈ 16 ft Set the calculator on RADIAN mode: 322 (2 ) (2x ) 2 ⎡⎣sin − cos x = 128. a. When 2 , the coordinate on the unit t 32 b. Let = Y1 − 1⎤⎦ circle is approximately (−0.4, 0.9) . Thus, 20 −0.4 tan 2 ≈ 0.9 = cot 2 ≈ −0.4 ≈ −2.3 45° 90° −0.4 −0.4 0 0.9 c. Using the MAXIMUM feature, we find: 20 ≈ ≈ csc 2 1 1.1 sin 2 ≈ 0.9 cos 2 ≈ −0.4 sec 2 ≈ 1 = −2.5 Set the calculator on RADIAN mode: 45° 0 90° θ is largest when = 67.5º . R
≈ 16 ft Set the calculator on RADIAN mode: b. Let Y1 = 20 322 32 2 ⎡⎣sin (2 x ) − cos (2x ) − 1⎤⎦ 128. a. When t = 2 , the coordinate on the unit circle is approximately (−0.4, 0.9) . Thus, 45° 90° 0 c. Using the MAXIMUM feature, we find: 20 sin 2 ≈ 0.9 cos 2 ≈ −0.4 tan 2 ≈ 0.9 = −2.3 −0.4 csc 2 ≈ 1 ≈ 1.1 sec 2 ≈ 1 = −2.5 −0.4 cot 2 ≈ −0.4 ≈ −0.4 0.9 Set the calculator on RADIAN mode: 45° 0 90° R is largest when θ = 67.5º .