Posted by Anonymous on Wednesday, July 27, 2011 at 11:50am.
Did you notice that in the first two terms the angles mentioned are complimentary angles?
And did you know that cos 70 = sin 20 ?
so....
cos70/sin20+cos57cosec33-2cos60
= cos70/sin20 + cos57/sin33 - 2cos60
= sin20/sin20 + cos57/cos57 - 2cos60
= 1+1 - 2(1/2)
= 1
Related Questions
math - how do i get sec70 x cos70 algebraically?
Trig - sin45cos25 + cos45sin25 = ?? a. cos70 b. sin70 c. cos20 d. sin 20 which ...
MATHS...... - solve the following. 1) x^3+3y^3+x+2y
Trig - Can someone check my answers so far? 1. Find the exact value of tan(-3&...
Maths - Hey :) I'm sitting my maths non-calculator GCSE tomorrow and am ...
PLEASE ANSWER MATHS!!! - solve algebriaclly the equation y=2sin2x+1 for 0<...
Trig - cos45cos25 - sin 45sin25 = ?? a. cos70 b. sin70 c. cos 20 d. sin 20 which...
physics - If a pulley is 57% efficient and you lift a 35kg box 5m how much work ...
Maths - solve the following pair of simultaneous equation: (x/a)+(y/b)=1 (x/b)+(...
MATHS - Critical help please. Level 3 maths algebraic methods is really hard. Q...
For Further Reading
