Question

Can anyone help me solve this?​

Answer 1

`\\ \rm{:}\rightarrowtail sin^245°-tan^260°+cos^290°`

• sin45=1/√2
• tan60=√3
• cos90=1

`\\ \rm{:}\rightarrowtail ((1)/(√(2)))^2-(√(3))^2+(0)^2`

`\\ \rm{:}\rightarrowtail (1)/(2)-3+0`

`\\ \rm{:}\rightarrowtail 1/2-3`

`\\ \rm{:}\rightarrowtail -5/2`

Answer 2

• - 2.5

Explanation:

• sin²45° - tan²60° + cos²90° =
• (√2/2)² - (√3)² + 0² =
• 1/2 - 3 + 0 =
• 0.5 - 3 =
• - 2.5