5-2 Verifying Trigonometric Identities
5-2 Verifying Trigonometric Identities
Verify each identity. 1. (sec2 ? 1) cos 2 = sin2
SOLUTION:
2. sec2 (1 ? cos2 ) = tan2 SOLUTION:
3. sin ? sin cos2 SOLUTION:
= sin3
4. csc ? cos cot = sin SOLUTION:
5. SOLUTION:
= cot4
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5-2 Verifying Trigonometric Identities
5. SOLUTION:
= cot4
6. tan csc2 ? tan = cot SOLUTION:
7.
?
= cot
SOLUTION:
8.
+
= 2 csc
SOLUTION:
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5-2 Verifying Trigonometric Identities
8.
+
= 2 csc
SOLUTION:
9.
+ tan = sec
SOLUTION:
10.
+
= sin + cos
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5-2 Verifying Trigonometric Identities
10.
+
= sin + cos
SOLUTION:
11.
+
= 1
SOLUTION:
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5-2 Verifying Trigonometric Identities
11.
+
= 1
SOLUTION:
12.
+
SOLUTION:
= 2 sec2 sin
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5-2 Verifying Trigonometric Identities
12.
+
SOLUTION:
= 2 sec2 sin
13. (csc ? cot )(csc + cot ) = 1 SOLUTION:
14. cos4 ? sin4 = cos2 ? sin2 SOLUTION:
15.
+
= 2 sec2
SOLUTION:
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5-2 Verifying Trigonometric Identities
15.
+
= 2 sec2
SOLUTION:
16.
+
= 2 sec
SOLUTION:
17. csc4 ? cot4 = 2 cot2 + 1 SOLUTION:
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5-2 Verifying Trigonometric Identities
17. csc4 ? cot4 = 2 cot2 + 1 SOLUTION:
18.
=
SOLUTION:
19. FIREWORKS If a rocket is launched from ground level, the maximum height that it reaches is given by h = , where is the angle between the ground and the initial path of the rocket, v is the rocket's initial speed,
and g is the acceleration due to gravity, 9.8 meters per second squared.
a. Verify that
=
..
b. Suppose a second rocket is fired at an angle of 80 from the ground with an initial speed of 110 meters per second. Find the maximum height of the rocket.
SOLUTION: a.
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