Question

4 into sin 30 degree + Cos 60 degree minus 3 into cos square 45 degree minus sin square 90 degree

Answer 1

Answer:

Step-by-step explanation:

Trigonometry,

We have,

4(sin⁴30°+ cos⁴60°)-3(cos²45°-sin²90°),

Have to evaluate.

As we know,

sin30°= ½,

cos30°= ½,

cos45°= 1/√2,

and, sin90°= 1,

By substitute the values we get,

4{(½)⁴+(½)⁴}-3{(1/√2)²-(1)²},

= 4(1/16 + 1/16) - 3(1/2 - 1),

= 4×⅛+3/2,

= ½+3/2,

= 4/2,

= 2,

That's it,

Hope it helped (≧∇≦)b,

HOPE IT HELPS.