1. [-/5.55 Points] DETAILS SALGTRIG4 7.1.001. An equation is called an identity if it is valid for (---Select--- @ value(s) of the variable. The equation 2x = x + x is an algebraic identity, and the equation sin2(x) + cos2(x) = is a trigonometric identity. Need Help? Read it 2. [-/5.55 Points] DETAILS SALGTRIG4 7.1.002. For any x it is true that cos(-x) has the same value as cos(x). We express this fact as the identity cos(-x) = Need Help? Read it 3. [-/5.55 Points] DETAILS SALGTRIG4 7.1.003. Write the trigonometric expression in terms of sine and cosine, and then simplify. 2 cos(t) tan(t) Need Help? Read it Watch It 4. [-/5.55 Points] DETAILS SALGTRIG4 7.1.009. Write the trigonometric expression in terms of sine and cosine, and then simplify. cot(u) cos(u) + sin(u) Need Help? Read it Watch It 5. [-/5.55 Points] DETAILS SALGTRIG4 7.1.011. Write the trigonometric expression in terms of sine and cosine, and then simplify. sec(0) - cos(0) sin(0)6. [-/5.55 Points] DETAILS SALGTRIG4 7.1.013. Simplify the trigonometric expression. 5 sin(x) sec(x) tan(x) Need Help? Read it Watch It 7. [-/5.55 Points] DETAILS SALGTRIG4 7.1.015. Simplify the trigonometric expression. 4 sin(t) + 7 tan(t) tan(t) Need Help? Read it 8. [-/5.55 Points] DETAILS SALGTRIG4 7.1.019. Simplify the trigonometric expression. csc2(x) - 1 CSC (x) Need Help? Read It Watch It 9. [-/5.55 Points] DETAILS SALGTRIG4 7.1.023. Simplify the trigonometric expression. 1 + sin(u) cos (U) cos( U) 1 + sin(u) Need Help? Read It Watch It10. [-/5.55 Points] DETAILS SALGTRIG4 7.1.027. Simplify the trigonometric expression. 6 6 1 - sin(a) 1 + sin(a) Need Help? Read It 11. [-/5.55 Points] DETAILS SALGTRIG4 7.1.031. Verify the identity. sin(0) cos(0) tan(0) Use a Reciprocal Identity to rewrite the expression in terms of sine and cosine, and then simplify. sin(0) sin(0) tan(0) cos(0) = sin(0) Need Help? Read It Watch It 12. [-/5.55 Points] DETAILS SALGTRIG4 7.1.037. Verify the identity. sin(-x) + cos(-x) = - sin x + cos x This answer has not been graded yet. Need Help? Read It13. [-/5.55 Points] DETAILS SALGTRIG4 7.1.046. Verify the identity. tan2(x) - cot (x) = sec-(x) - csc2(x) This answer has not been graded yet. Need Help? Read It 14. [-/5.55 Points] DETAILS SALGTRIG4 7.1.055. Verify the identity. 2 cos2(x) - sin2(x) = 3 cos2(x) - 1 This answer has not been graded yet. Need Help? Read it 15. [-/5.55 Points] DETAILS SALGTRIG4 7.1.065. Verify the identity. 1 - sin(x)+ cos(x) = 2 sec(x) cos (x) 1 - sin(x) This answer has not been graded yet. Need Help? Read It16. [-/5.55 Points] DETAILS SALGTRIG4 7.1.083. Verify the identity. sin(0) = cot(0) + csc(0) 1 - cos(0) This answer has not been graded yet. Need Help? Read It 17. [-/5.55 Points] DETAILS SALGTRIG4 7.1.089. Make the indicated trigonometric substitution in the given algebraic expression and simplify (see Example 7). Assume that 0