Question

sin^4a+0.25sin^22a=
помогите решить

Answer 1

$= { sin( alpha ) }^{4} + 0.25 times 4 { sin( alpha ) }^{2} { cos( alpha ) }^{2} = { sin( alpha ) }^{4} + { sin( alpha ) }^{2} { cos( alpha ) }^{2} = { sin( alpha ) }^{2} ( { sin( alpha ) }^{2} + { cos( alpha ) }^{2} ) = { sin( alpha ) }^{2}$