Question

2cos² 90° + 4cos 45°+tan²60°+3 cosec² 60° +1/3 sec 60° - 7/2 sec² 45° +2 cosec 30° - 1​

Answer 1

Step-by-step explanation:

$= > 2 \times 0 + 4 \times \frac{1}{ \sqrt{2} } + ( { \sqrt{3} }) \: ^{2} + 3 \times {( \frac{2}{ \sqrt{3} } })^{2} + \frac{1}{3} \times 2 - \frac{7}{2} \times \sqrt{2} + 2 \times 2 - 1 \\ = > 2 \sqrt{2 } + 3 + 3 \times \frac{2}{3} + \frac{2}{3} - 7 \sqrt{2} + 4 - 1 \\ = > 2 \sqrt{2} + 3 + 2 + \frac{2}{3} - 7 \sqrt{2} + 3 \\ = > 2 \sqrt{2} - 7 \sqrt{2} + \frac{2}{3} + 3 + 3 + 2 \\ = > - 5 \sqrt{2} + \frac{2}{3} + 8 \\ = > \frac{26}{3} - 5 \sqrt{2}$