COS 13п 15 COS Зл 15 + sin 13л 15 sin 3п 15 Answer: cos 10п 15 = cos 2П 3 = -1/2

Q: 10. Sec -405 degrees 12. Cot -90 degrees 14. cos 360 degrees  16. sin -225 degrees

A: 10)

Q: V34 cos co - 59.036°) = 4 cos co -59.036°) V34 o - 59.036° - Cos" (会 o -59.036= 46.686 0 = ° 105.才22…

A: The objective is to find the value of theta.

Q: 2, 3π cot²( -B) if sin 2ẞ 4 5

A: Answer : 1.1879Let me know if you have any question, and please don't forget rate my…

Q: �=-1cos-π6=-cos2π how did you get the cos2π

A:

Q: 7) Use sun and difference formula to verify the identity cos(A+B) cos(A-B) = cos2A + cos2B-1 A-B) =…

A:

Q: 14. If Cos 2 A.Cos 2B = Cos 20, prove that: Sin² A.Cos² B+Cos² A.Sin² B = Sin²0

A: Given We have to prove .

Q: O) sinßcosa + cosßsina sin 60°cos 45° + Cos (G0°sin 45°

A:

Q: Find sec 0 if cos 0 ||

A: Our Aim is to find sec θ given that cos  θ=13

Q: compute without using a calculator.

A:

Q: 2, 3π cot²( -B) if sin 2ẞ 4 5

A: See the attachment.Explanation:

Q: Find cos 20 if sin 0 = cos 20

A:

Q: so what is the solution of sin 1=.  , sin 2 =.  , sin 3 = and sin 4=.

A: We need determine the values of sin 1, sin 2, sin 3, sin 4.

Q: Verify the identity. cos 7x- cos 9x tan 8x sin 7x- sin 9x Statomont

A:

Q: -4 sin 0 = Find cose jif 5 and 0 terminates in QIV.

A: Given By using the identity we get But terminates in fourth quadrant and so value of is…