If a and b are positive,then the relation sinθ=(2a+3b)/3b is

Consider the following statements

1.sin 66° is less than cos 66°

2.sin 26° is less than cos 26°

Which of the above statements are correct?

If θ is an acute angle and sinθcosθ=2cos³θ-1.5cosθ,then  what is sinθ equal to 

If tan(x+40)°tan(x+20)°tan(3x)°tan(70-x)°tan(50-x)°=1,then the value of x is equal to

cosθ/(1-sinθ) is equal to

If x=acosθ and y=bcotθ ,then (ax^-1-by^-1)(ax^-1+by^-1) is equal to