Posted by **Edwards** on Wednesday, August 3, 2011 at 9:38am.

1. Show that Sin3 Theta - Cos2 Theta = (1 - Sin Theta)(4Sin^2 Theta + 2Sin Theta - 1).

Without using a calculator, show that Theta = 18 degrees is an exact solution of the equation Sin3 Theta = Cos2 Theta.

Justifying your answer, find the exact values of:

i) Sin18 degrees.

ii) Sin234 degrees.

## Answer this Question

## Related Questions

- math - knowing that 2(theta) can be written as theta + theta, find the ...
- Calculus - I wanted to confirm that I solved these problems correctly (we had to...
- Mathamatics - Solve the following trigonometry identities. a) 1-cos2(theta) = ...
- Calc - Calculate the exact values of sin(theta) cos(theta) and tan (theta) when ...
- easy trig - If sin(theta)=[sqrt(70)]/7 and theta is in Quadrant two, find the ...
- simple trig - If sin(theta)=[sqrt(70)]/7 and theta is in Quadrant two, find the ...
- maths - show that sin3theta-cos2theta =(1-sin theta)(4sin squared theta + 2sin ...
- maths - show that sin3theta-cos2theta =(1-sin theta)(4sin squared theta + 2sin ...
- trig - If sin theta is equal to 5/13 and theta is an angle in quadrant II find ...
- Pre Cal - sin theta - 2sin^2 theta = 0 I'm using the up carrot sign to signal "...

More Related Questions