Sunday

February 1, 2015

February 1, 2015

Posted by **Jennifer** on Tuesday, May 21, 2013 at 5:42pm.

- pre calc -
**MathMate**, Tuesday, May 21, 2013 at 6:12pmIf sin(x)=-3/5 in Q3, then

cos(x)=-4/5 (using cos²(x)=1-sin²(x))

Similarly,

cos(y)=5/13 in Q1 means sin(y)=12/13

sin(x-y)=sin(x)cos(y)-cos(x)sin(y)

=-3/5*5/13 - (-4/5)*12/13

=(-15+48)/65

=33/65

**Answer this Question**

**Related Questions**

Urgent - draw an angle x in the 1st quadrant with sinx=3/5, and an angle y in ...

trig - Angle x is in the second quadrant and angle y is in the first quadrant ...

trig - Angle x is in the second quadrant and angle y is in the first quadrant ...

Math - Angle x is in the second quadrant and angle y is in the first quadrant ...

Trig - given that sinx=3/4 and cosy=-5/13 and both x and y are in quadrant II, ...

Pre-calc/Trig - If cot(a)=3 and sin(b)= (15/17) where a being alpha lies in ...

pre-calc - Can someone help me find the exact value of 4csc(3pi/4)-cot(-pi/4)? ...

Math Trig Find Quadrant I II III IV - In which quadrant is the terminal side of ...

maths - if sinx=3/5,cosy=12/13,where x and y both lie in 2nd quadrant, find the ...

math - Angles x and y are located in the first quadrant such that sinx=3/5 and ...