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