Standard angles Trigonometrical ratios

sin45sin30+cos45cos30=?

•  $\frac{1+\sqrt{3}}{2\sqrt{2}}$  

•  $\frac{1+\sqrt{2}}{3\sqrt{2}}$  

sin60sin30+cos60cos30=?

• 3/2

• 1

cos45cos60-sin60sin45=?

•  $\frac{1-\sqrt{3}}{2\sqrt{2}}$  
  

•  $\frac{1+\sqrt{3}}{2\sqrt{2}}$  
  

sin²30+sin²45+sin²60+sin²90=?

• 5/2

• 3/2

cos²30+cos²45+cos²60+cos²0=?

• 5/2

• 3/2

tan²30+tan²45+tan²60+tan²0=?

• 13/3

• 11/3

2sin²30-3cos²45+tan²60=?

• 2

• 1/2

sin²30cos²45+4tan²30+ {(sin²90)/2} -2cos²90+{(cos²0)/24}

• 2

• 3

4(sin⁴60+cos⁴30)-3(tan²60-tan²45)+5cos²45=?

• 1

• 0

cosec²45.sec²30 (sin²30+4cot²45-sec²60)

• 2/3

• 1/3