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If cosx=4/5, cosy=12/13 in Quad.

  1. If cosx=4/5, cosy=12/13 in Quad. IV, find sin(x+y)
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    2. Kevin asked by Kevin
    3. views icon 422 views
  2. If cosx=4/5, cosy=12/13 in Quad. IV, find sin(x+y)
    1. answers icon 3 answers
    2. Kevin asked by Kevin
    3. views icon 838 views
  3. How do I get (sinx cosy + cosx siny) (cosx cosy + sinx siny) in the form of 1/2(sin2x + sin2y)?
    1. answers icon 1 answer
    2. Anonymous asked by Anonymous
    3. views icon 651 views
  4. If sinx=3/5,cosy=-12/13,where x and y both lie in 2nd quad.Find the value os sin(x+y).
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    2. Anonymous asked by Anonymous
    3. views icon 612 views
  5. If sec(x+y),sec(x),sec(x-y) are in A.P. then prove that cosx= +-√2 cos y/2 where cosx and cosy are not equals to 1,
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    2. Kinjal asked by Kinjal
    3. views icon 2,196 views
  6. Suppose f(x) = sin(pi*cosx) On any interval where the inverse function y = f ^–1(x) exists, the derivative of f ^–1(x) with
    1. answers icon 1 answer
    2. Anonymous asked by Anonymous
    3. views icon 509 views
  7. Suppose f(x) = sin(pi*cosx) On any interval where the inverse function y = f –1(x) exists, the derivative of f –1(x) with
    1. answers icon 8 answers
    2. Thomas asked by Thomas
    3. views icon 4,073 views
  8. if f(x,y) = e^(-x)cosy + e^(-y) cosxfind (∂^2 f)/(∂x^2 )+ (∂^2 f)/(∂y^2 )- 2(∂^2 f)/∂x∂y
    1. answers icon 4 answers
    2. alya asked by alya
    3. views icon 658 views
  9. Please Help:please solve this proof: cosx- cosy = -2sin(x+y/2)sin(x-y/2)
    1. answers icon 2 answers
    2. Kim asked by Kim
    3. views icon 740 views
  10. Use a counter example to show that cos(x+y)= cosx +cosy is not an identity
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    2. Brandon asked by Brandon
    3. views icon 913 views