Posted by **Abby** on Sunday, February 28, 2010 at 11:39am.

1) Use the cofunction identites to evaluate the expression without the aid of a calculator.

cos^2 18 degrees + cos^2 72 degrees.

## Answer This Question

## Related Questions

- Math(Please check) - 1) Use the cofunction identites to evaluate the expression ...
- trig - Evaluate sin(29 degrees)cos(31 degrees) + cos(29 degrees)sin(31 degrees) ...
- maths - evaluate without using a calculator, leaving your answer as surds (a)...
- Trigonometry - Please review and tell me if i did something wrong. Find the ...
- Pre-Calc - Evaluate the expression without using a calculator(show work please...
- Please help Math - a. Use the formulas for lowering powers to rewrite the ...
- Trigonometry - LONESTAR - Simplifying steps without using the calculator for: ...
- Trig - What is the exact value of cos 40 degrees cos 50 degrees minus sin 40 ...
- trig - Assume that we know sin(18 degrees)=(sqrt(5)-1)/4, cos(18 degrees)=(sqrt(...
- trig - I do not understand for my life how to solve this problem. Evaluate the ...

More Related Questions