(5 points) Use a sum/difference identity to find the exact value of cos( -15°). Do not use reference angles i.e do not calculate cos 15° You should be able to do this with only a sum/difference identity and standard angles. No Decimal Approximations.
Use a sum or difference formula to find the exact value of the following Use a sum or difference formula to find the exact value of the following. 271 410 21 41 sin + cos sin 5 15 15 COS 0 8 Х
Use a sum or difference formula to find the exact value of the trigonometric function. sin 12 TT sin 12 (Simplify your answer, including any radicals. Use integers or fractions for any numbers in the expression.)
15. Find the exact value of cos cos co cos - sin sin using a sum or difference formula.
Express the sum or difference as a product. If possible, find the exact value of this product. sin sin 7x 12 12 Express the difference as a product. 7 sin sin Find the exact value of the product obtained above. (Simplify your answer. Type an exact answer, using radicals as needed. Use integers or fractions for any nu denominators.)
a) Using a sum or difference formula,find the exact value of sin n( 112 ). b) Prove that cos(a + b) cos a cos B - 1 -tan a tan ß.
5. Use the Sum and Difference Identities or Half-Angle Identities to find the exact value. (Hint: 11 – 4 + or (6) sin () (Hint: : 037
Use an identity to find the value of the expression. Do not use a calculator. sin 66° csc 66° sin 66° csc 66°= (Type an exact answer. Simplify your answer.)
QUESTION 12 Use a double-angle or half-angle identity to find the exact value of: cos(0) = and 270° <=< 360°, find sin 5 OAV10 10 B. 10 C. None of these OD 10 3 17 OE 4 QUESTION 13 Use a double-angle or half-angle identity to find the exact value of: 3 sin(0)= and 0° <o<90° , find tan 5 - šar 10 OA. 3 B.V10 Octs OD. -V10 E V30 QUESTION 11 Use a double-angle or half-angle identity to...
Use the appropriate sum and difference foemula to calculate the exact value of each expression. a) tan (+ b) cos (240° + 459 c) sin (7/3 - 1/1