Question

please solve this question with full process ​

Answer 1

HEY ANAYA:

GIVEN HERE:

Y=10[cos^2 (15°)-sin^2 (15°)]

we know that:

[[cos2x= cos^2 x-sin^2 x:]]

so,

here, y will be,

==>y=10[cos(2 *15°)]

==.>y=10[cos 30°]

==>y=10( √3/2).

we know,

[cos 30°=√3/2]

==>y=5√3

put here √3=1.732

then,

==>y=5 × 1.732

==>y= 8.66.

I hopes its helps u.

@ABHI.