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maths c2 edexcel

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astarmathsandphysics:
are they cos^2 x sin^2 x etc

halosh92:
solve the following equations for thita, in the interval 0<thita<360

a) sin thita + cos thita = 0

b) (sin thita - 1)(5 cos thita + 3) = 0

solve the following equations for "x" , giving your answers to 3sf where appropriate, in the intervals indicated:

a) tan x = - sqrt3 /3             0<x<720
b) tan x = 2.90                    80<x<440


solve in the intervals indicated . the following equations for thita, where thita is measured in radians,
give your answer in terms of pie or 2pie or 2 decimal places.

a)  sin thita =0         -2pie<thita<2pie

b) 2 cos thita = 3 sin thita       0<thita<2pie

halosh92:
yep
sorry typing error

astarmathsandphysics:
a)sin x +cos x=0
sin x =-cos x
tan x =-1
x=-45,180-45, 360-45 etc

astarmathsandphysics:
(sin x-)(5cos x+3)=0
sinx-1=0 so sinx =1 so x=90, 180-90, 360+90, etc
only 90 in range
5cos x+3=0
cos x=-3/5 so x=126.9
x=126.9,360-126.9, 360+126.9, etc
only 1st two in range

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