CosA-[1+sin2A]1/2
=TanA
SinA-[1+sin2A]1/2

Step-by-step explanation:

Step(I):-

Given

By using  sin²x+cos²x =1

now

  =  

=      

=

After simplification , we get

=

=

= tanA





the least common denominator is 40

∠acb = 8°

step-by-step explanation:

∠xba lies on the circle and is half the measure of the intercepted arc ax

hence

measure of arc ax = 2 × 42° = 84°

∠acb is outside the circle and is

∠acb = (arcab - arcax ), hence

∠acb = 0.5 (100 - 84) = 0.5 × 16° = 8°