Question

evaluate -
4(sin^4 30+cos^4 60)-3(cos^2 45-sin^2 90)​

Answer 1

Step-by-step explanation:

4(sin^4 30+cos^4 60)-3(cos^2 45-sin^2 90)

as we know the values of cos60&45 and sin30&90

directly apply and solve

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

4(2/16)-3(-1/2)

(4×1/8)-(-3/2)

-×- = +

so,

1/2+3/2=4/2=2

here is ur answer

hope it was helpful.