Prove the identity. 2 sin 20 cos 20+ cos 40=1-sin 40 To verify the identity, work each side separately until you obtain the same expression. Start with the left side. Choose the correct step and transform the expression according to the step chosen. 2 sin ²0 cos ²0 + cos 40 = Now apply an identity to just the expression in the parentheses The part of the expression in parentheses simplifies to Continue the proof. 2 sin 20 cos 20+ cos 40 = a way that will further the proof of the identity. Apply a 1-sin ¹0 identity.

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

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

Q: sin(A)cos(B)+cos(A)sin(B) Choose. sin(A)cos(B)- cos(A)sin(B) Choose. cos(A-B) tan(A)+ tan(B)…

A:

Q: Rewrite expression as a sum or difference. This one i had a hard time answering! 6 sin 5x cos 2x

A: Given expression is  We will use the following identity to express the given expression as a sum or…

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: cos - I resulted in a negative answer. Why is it impossible for cos to be 12 negative?

A: Let's find.

Q: Use the fact that sin (38) 0.6157 to complete the expression. 22 cos() 0.6157

A: We have to use the fact  sin(38°) ≈ 0.6157 to complete the expression  cos(.... °) ≈ 0.6157

Q: Find exact values for cach expression using sum and difference, double and half angle, or sum to…

A:

Q: Verify the identity. sin x/ 1-sin x − cos x/ 1-sin x= 1-cot x /csc x-1 Working with the left-hand…

A: Take LHS and divide by sinx in both parts