Find the period N of the sequence x(n) = cos 2nn cos 15 + sin sin 8 60 15 120 4

Q: Find and explain  the errors that have been made

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Q: Which expression is equal to cos(6t)?

A: Recall:  cos(2t)=cos2(t)-sin2(t)     Given,   cos(6t)

Q: evaluate exactly cos-1(-3/2)

A: -3/2 lies outside the domain of the function. Hence we will have no solution

Q: (cose – sin0)² = 1 – 2sin@cos0 %3D

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Q: Find all solutions to 10 cos2 r-13 cos T = -4 sec2 r+4 tan? r on 0, 27.

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Q: sin20 de 1+cos²0

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Q: cos49-sin*0 2. = 1– tan20 cos²0

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Q: Sin

A: Given that: (Sin²30°+cos²30°+sin²45°+cos²45°)²

Q: Proving Identities. Verify the identity. (1-sin²t+ cos² t)² +4sin² t cos² t = 4cos² t

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Q: Solue [2 cos 0-31-5 from 0 02360°

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Q: 7T 12 COS COS 뜸 + sin sin 5T 12

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Q: (1+Sin O+COs02=a(+Sin0)+cose)

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Q: Verify the identity : cos(α - β)/(cos α .sin β) = tan α + cot β

A: Given : cosα - βcosα sinβ = tanα + cotβ

Q: Show that V2 + V2 cos 2 and cos 16 and use it to find sin 16 Show that

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Q: cos40cos 15- sin40sin15

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Q: Find cos 20 if sin 0 = cos 20

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Q: cos 8+sin e ) sec 20 + tan 20 cos 0-sin e

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Q: Calculate the value of expression: sin- cos--2· cos- • tan 5 2

A: Explanation of the answer is as follows

Q: tan(C + A)tan(C – A)tan(B+ D) = tan(D – B)

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Q: sin 60⁰ cos 300⁰

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Q: Establish the identity 2 2 cos - sin 0 2, 1 - tan 0 2 = cos 0.

A: To establish the identity

Q: i 4. (3– 3sin@)(3+3sin@)

A: