Question

Sinx+Sinx=1 then cos^x+coscube x=?​

Answer 1

Answer

7√3/8

Explaination

Sin x +Sin x = 1

then Sin x must equals to 1/2

As we know that Sin 30° has the same value

So x= 30°

Q :- cos x + cos^3 x

Cos 30° + cos^3 30°

• √3/2. + √3/2 ^3. {Cos 30°=√3/2}

√3/2 ( 1 +3/4)

√3/2 × 7/4

= 7√3 / 8