Trigonometry
What is sin90?
cos0=?
cosx repeats every?
tanx repeats every?
sin30=cos30
True or False
Solve sinx=cosx for x≤180
sin50=sin310
True or false
cos70=cos110
True or False?
tan45=tan225
True or False
sin²x+cos²x=?
If sin²x+cos²x=1Which of these are wrong?
A 1+cot²x=cosec²x
B tan²x+1=sec²x
C sec²x-1=tan²x
D cosec²x+1=cot²x
Sin(A+B)=
A sinAsinB-cosAcosB
B sinAcosB-cosAsinB
C cosAsinB+cosBsinA
D sinAcosA+sinBcosB
Which of these are correctcos2A=
A sin²A-cos²A
B 2sin²A-1
C cos(A+A)
D 1-2cos²A
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