plzz solve the 4th question
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may be this answer help u
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sharon17:
it's not clear
anyway thanks
the value of cos π/4 =1/√2 not 1
your answer is wrong
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a) cos 7π/4 -sin 7π/4
=cos (2π-π/4)-sin(2π-π/4)
=cos π/4+sin π/4
=(1√2)+(1/√2)
=√2 answer
b)cos 11π/3 - sin 11π/3
=cos (4π-π/3)-sin (4π-π/3)
=cos π/3 +sin π/3
=√3+1/2 answer
=cos (2π-π/4)-sin(2π-π/4)
=cos π/4+sin π/4
=(1√2)+(1/√2)
=√2 answer
b)cos 11π/3 - sin 11π/3
=cos (4π-π/3)-sin (4π-π/3)
=cos π/3 +sin π/3
=√3+1/2 answer
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