please answer guys. Really is am hoping all of you. you can also answer any one in the following. please help me guys.
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Q.1 .ans
cos θ:sin θ=1:2
cos θ/sin θ=1/2
2cos θ=sin θ____eq.1
now,
sin² θ+cos² θ=1
(2cos θ)²+cos² θ=1_____from eq.1
4cos² θ+cos² θ=1
5cos² θ=1
cos² θ=1/5
taking square root
cos θ=1/√5
now ,
2cos θ=sin θ
sin θ=2(1/√5)
sin θ=2/√5
now,
cos θ-2sin θ/4cos θ+2sin θ=(1/√5-4/√5)/ (4/√5+4/√5)
=-3/8
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