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cos(3π/8)*sin(5π/8)=?
The original formula = - cos (3 π / 8) * sin [π - (5 π / 8)]
=-1/2*sin(3/4π)
=-√2/4
cos∏/3－tan∏/4+3/4tan²∏/6+cos²∏/
How to do cos Π / 3-tan Π / 4 + 3 / 4tan and#178; Π / 6 + cos and#178; Π / 6 + SIN3 Π / 2
Original form
=1/2-1+3/4*(√3/3)²+(√3/2)²+(-1)
=1/2-1+1/4+3/4-1
=-1/2
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