If cos 20 cos 40 + sin 20 sin 40 and 20 is in QIV , then cot 20 is 8 equal to 39 39 - 39 39

Q: Which expressions are equal to cos 93° ?

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Q: Prove that 17 cos? 40° cos 80° + cos 80° cos? 20° + cos 200° cos 40° SOS 16

A: Consider the expression cos240°cos280°+cos280°cos220°+cos2200°cos240°=1716

Q: 1024 (cos 250° +i sin 250°) Enter the first root below and the remainder of the roots on your…

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Q: Identify the value that is equivalent to sir O sin 28 O cos 28 O cos 118 O sin 118

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Q: 13. Find the exact value of sin 157.5° and cos 157.5° and tan157.5⁰ Leave answers exact and…

A: To find the exact value of , and .

Q: Which multiple angle formula could be used to determine  the exact value of cos 105 º ?     sin 60…

A: For finding the angle value of cos(105)

Q: Use a sum or difference formula to find the exact value of the expression sin 80° cos 50° - cos 80°…

A: Our aim is to find the exact value of the expression given below:-sin 80° cos 50° - cos 80° sin 50°…

Q: 2) Establish the identity cos(a+B) cos(a-ß) cot acot B-1 cot acot B+1 Show each step to justify your…

A: Solved below

Q: Which of the following is an equivalent expression to sin - (sin )(cos²0)? O cos²e O cos³e O sin²e O…

A: Given expression      sin(θ)-(sin(θ))(cos2(θ)) Here we use the following identity:…

Q: >Please write neatly and clearly otherwise 1) Find the exact simplified value. 19TH 23n -2 sin 12 -2…

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Q: Evaluate each expression exactly. Enter your answer in radians. () A) cos COS %3D 57 -1 B) cos COS…

A: Recall: cos(2π-θ)=cos θ cos-1(cos θ)=θ, θ∈[0,π]

Q: The expression (cos 90°) (cos 30°) (sin 90°) (sin 30°) can be rewritten as which of the following?…

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Q: What is the exact value of: sin 75 degrees + sin 15 degrees?

A: 32 is the correct answer

Q: What is the cofunction of the complement of cos 22 o?   a. cos 22o   b. sin 68o   c. sin 22o   d.…

A: Cofunction of cosine is sine angle. Complementary means if we add both angles we will get 90 degrees…

Q: sin Cabo-0 Jo tan (180-0). COS (180+x). (sIn?3C +COS?C)

A: We have to find: sin(360∘-x) ×tan(180∘-x)cos(180∘+x)(sin2x+cos2x)

Q: 11) Use sum-to-product or product-to-sum to find the exact value of each expression a. sin 195° ·…

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Q: Find the exact value of cos 37° cos 53°+ sin 37° sin 53°. Support your answer with work using the…

A: Given expression :

Q: sin 15° = Edit sin 75° = ? Edit cos 15° = ? Edit cos 75° = Edit

A: detailed solution is given below

Q: Perform the indicated operation and write the result in standard form. (2(cos 45° + i sin 45°))

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Q: Find 21 - 22, if 21 2 (cos 120° + i sin 120°) 22 = 5 (cos 30° + i sin 30°) O-5√3+5i O 5√3-5i O 10…

A: z1=2(cos120°+isin120°)z2=5(cos30°+isin30°)we know  i.i=-1