SOURCE: (sin-cos)(sin+cos)
(sinX-cosX)(sinX+cosX)
=(sin^2 - Cos^2X)
=Sin^2X - (1-Sin^2X)
=Sin^2X -1 + Sin^2X
=2Sin^2X -1
Zulfikar Ali
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SOURCE: sin x cos x = -1/2 solve for x
sin x cos x = -1/2
=> 2sinx cosx = -1
=> sin(2x) = -1
=> 2x = (3pi)/2 OR 2x = 270°
=> x = 3pi/4 OR x = 135°
SOURCE: Please help me change:
we can represent 5 sin X --3 cos X as
5.83 sin ( X - 30.96)
if you want steps please leave a comment and don't forget to vote for me thank you
SOURCE: cos A/1-tan A + sin A/1-cot A = sin A + cos A
you can follow this link and can get the solution http://mathforum.org/dr.math/faq/formulas/faq.trig.html
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