2018年5月20日 · #"using the "color(blue)"trigonometric identity"# #•color(white)(x)cos2x=cos^2x-sin^2x# #"consider the left side"#

2017年9月24日 · 1/sqrt2, or, sqrt2/2. Recall that, costheta=sin(90^@-theta). :. cos67^@=sin(90^@-67^@)=sin23^@.....(1).

#cos23^o=u_x/u# #u_x=cos23^o*u=cos23^o*90=82.8m/s# Vertical axis. Note: You should aim towards finding the total time of motion on the vertical axis. Afterwards, the horizontal motion is …

2016年1月15日 · You can use the sum-to-product identities ... (sinA-sinB)/2=cos((A+B)/2)sin((A-B)/2) Now, solve for A and B ...

2015年4月26日 · That depends on what you already know. If you have the sum and difference identitiy, find two special angles whose sum or difference is (23 pi)/12 (2 pi)/12 + (21 pi)/12 …

2016年5月7日 · Horizontal displacent of suitcase during this time of fall is #ucosalphaxxT=90*cos23*9.57=793m# So the suitcase will land at a distance of 793m from …

2018年3月29日 · b~~26.57m. By the cosine formula, b^2=c^2+a^2-2ac*cosB, =43^2+19^2-2*43*19*cos23^@, =1849+361-1634*0.921, =2210-1504.105, =705.895.

a_x= 6.3"m/s" a_y=2.7"m/s" Figure (1) shows a representation of the acceleration vector with its components in the vertical(a_y) and in the horizontal(a_x) directions.

Solving concept. To solve a trig equation, transform it into one, or many, basic trig equations. Solving a trig equation, finally, results in solving various basic trig equations.

2015年11月9日 · The Law of Sines The Law of Sines states a/(sinA)=b/(sinB)=c/(sinC) We are given a b and B so we can set them equal to each other and solve for Sin of A 10/(sinA) = …