Q 1. If sin( 36 ) cos/- cos( 3/ )sin/= 2sin( aB ) cos[ ap ), then the value of a is O 0.5 0 4 O 1 O 8 2. If sin( x + y ) = 0.8 and sin( x -y ) = 0.35, what is the value of cosxsiny rounded to the nearest hundredth? O 0.45 O 0.23 O 1.15 O 0.90 3. Prove the identity below. Show all steps of your reasoning to receive full credit. sin x+ 2 - sinx + cosxQ 4. Using the double angle identity, which of the following are equivalent to cos O 2 sin COS O cos - sin O 1 - 2 sin O 2 cos 16 Q 5. Use a sum or difference identity to find an exact value for sin 75Q 6. Which of the following are equivalent to sin 31 cos 10 + cos31 sin 10"? O cos41" O cos 210 O sin 210 O sin 410