Verifying a Trigonometric Identity In Exercises 49-60 verify the identity algebraically. Use a graphing utility to check your result graphically. 49. 2 sec² x 2 sec² x sin² x - sin² x - cos²x = 1
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- Verifying a Trigonometric IdentityIn Exercises 19–24, verify the identityalgebraically. Use the table feature ofa graphing utility to check your resultnumerically.Proof Use the trigonometric identitycos2 x + sin2 x = 1 to prove that (Hint: Beginby multiplying the numerator and denominator by cos x + 1.)Verification of Trigonometric Identities
- Verifying a Trigonometric Identity InExercises 9–18, verify the identity.Verifying Trigonometric IdentitiesThink About It In Exercises 67–70, explain why theequation is not an identity and find one value of thevariable for which the equation is not true.67. sin θ = √1 − cos2 θ 68. tan θ = √sec2 θ − 169. 1 − cos θ = sin θ 70. 1 + tan θ = sec θ
- Verify the identity algebraically. Use the table feature of a graphing utility to check your result numerically. (Simplify at each step.) 6 cos(x) − 6 cos(x) 1 − tan(x) = 6 sin(x) cos(x) sin(x) − cos(x)Verify the identity algebraically. Use the table feature of a graphing utility to check your result numerically. (Simplify at each step.) 8 cos(x) minus 8 cos(x) divided by 1 minus tan(x) equals 8 sin(x) cos(x) divided by sin(x) minus cos(x). 8 cos(x) − 8 cos(x) 1 − tan(x) = 8 sin(x) cos(x) sin(x) − cos(x)Using a Calculator In Exercises 75–90,use a calculator to evaluate the trigonometricfunction. Round your answer to four decimalplaces. (Be sure the calculator is in thecorrect mode.)75. sin 10° 76. tan 304°77. cos(−110°) 78. sin(−330°)79. cot 178° 80. sec 72°81. csc 405° 82. cot(−560°)83. tanπ9 84. cos2π785. sec11π8 86. csc15π487. sin(−0.65) 88. cos 1.3589. csc(−10) 90. sec(−4.6)